What's the difference between rack and shelf?

Rack


Definition:

  • (n.) Same as Arrack.
  • (n.) The neck and spine of a fore quarter of veal or mutton.
  • (n.) A wreck; destruction.
  • (n.) Thin, flying, broken clouds, or any portion of floating vapor in the sky.
  • (v. i.) To fly, as vapor or broken clouds.
  • (v.) To amble fast, causing a rocking or swaying motion of the body; to pace; -- said of a horse.
  • (n.) A fast amble.
  • (v. t.) To draw off from the lees or sediment, as wine.
  • (a.) An instrument or frame used for stretching, extending, retaining, or displaying, something.
  • (a.) An engine of torture, consisting of a large frame, upon which the body was gradually stretched until, sometimes, the joints were dislocated; -- formerly used judicially for extorting confessions from criminals or suspected persons.
  • (a.) An instrument for bending a bow.
  • (a.) A grate on which bacon is laid.
  • (a.) A frame or device of various construction for holding, and preventing the waste of, hay, grain, etc., supplied to beasts.
  • (a.) A frame on which articles are deposited for keeping or arranged for display; as, a clothes rack; a bottle rack, etc.
  • (a.) A piece or frame of wood, having several sheaves, through which the running rigging passes; -- called also rack block. Also, a frame to hold shot.
  • (a.) A frame or table on which ores are separated or washed.
  • (a.) A frame fitted to a wagon for carrying hay, straw, or grain on the stalk, or other bulky loads.
  • (a.) A distaff.
  • (a.) A bar with teeth on its face, or edge, to work with those of a wheel, pinion, or worm, which is to drive it or be driven by it.
  • (a.) That which is extorted; exaction.
  • (v. t.) To extend by the application of force; to stretch or strain; specifically, to stretch on the rack or wheel; to torture by an engine which strains the limbs and pulls the joints.
  • (v. t.) To torment; to torture; to affect with extreme pain or anguish.
  • (v. t.) To stretch or strain, in a figurative sense; hence, to harass, or oppress by extortion.
  • (v. t.) To wash on a rack, as metals or ore.
  • (v. t.) To bind together, as two ropes, with cross turns of yarn, marline, etc.

Example Sentences:

  • (1) More than 250 borrowers contacted the Guardian to tell us how and why they borrowed and how their debts racked up.
  • (2) When the two sides played here 77 days earlier Stoke had racked up a 5-0 lead by half-time, the first time that had happened to Liverpool since 1976, but this time Hughes’s attackers had no delicacy around the penalty area.
  • (3) In one clothes shop, with racks of discounted Calvin Klein and DKNY, the manager, Sav, explains what's happened: "In this crisis, the middle classes have been hollowed out."
  • (4) But Nel said that for Steenkamp to have fallen on to the rack, given she was found with her head slumped over the toilet, she would have had to have got up.
  • (5) Around 50 suburban Chicago police departments and sheriff’s offices assisted, racking up more than $300,000 in overtime and other costs, according to an analysis that the Daily Herald newspaper published in early October.
  • (6) Against small diurnal fluctuations, stable vertical gradients (about 1 degree C between tops and bottoms of racks) were observed among one hour averages of room air temperatures.
  • (7) TfL has tried to minimise congestion by issuing permits for roadworks but said it had encountered a “repeat offender” in BT, which has racked up thousands of pounds in fines.
  • (8) The prospect of further ­demonstrations and strikes has raised fears of social unrest in a country that has been racked by street violence for the past 18 months.
  • (9) The second biggest YouTube channel in July 2014 was DisneyCollector, with its collection of toy-unboxing videos racking up 268m views in the month, putting it ahead of musician Shakira’s 226.6m views.
  • (10) Contact time (in seconds) to a circular metal rack positioned in the center of the animal activity monitor was also recorded as goal-directed exploratory activity.
  • (11) The spark for the longest-running protest in modern Tunisian history was lit on 17 December in the town of Sidi Bouzid, in the rural interior of Tunisia, a region of olive groves and agriculture which is racked by vast unemployment, repression and poverty a world away from the riches of the Tunisian tourist coast and the propaganda of Tunisia's "economic miracle".
  • (12) Removal of a cage from the rack and getting out a rat caused increase in plasma concentrations of corticosterone in its remaining cage mates.
  • (13) For example, the Pacers lost 107-97 , at home on Tuesday, in a game where their starting center Roy Hibbert's disappearing act reached nearly-comical levels as he racked up 0 points, 0 rebounds, 1 meager assist and four personal fouls in 12 minutes of playing time.
  • (14) Adoboli racked up the giant losses undetected through three means, Wass said.
  • (15) Certain smears, such as from semen or from serous fluids where malignancy is suspected or known, must be stained on separate racks.
  • (16) That enthusiasm for elegant, understated clothing and bags has paid off, as Prada has bucked the downturn to open stores around the world – 63 in the year to last September – and rack up €409m (£352m) in profit in the first three quarters of 2012, a huge rise of 50% year on year, boosted by an increase of 41% in Asian sales.
  • (17) At any other moment, Chilcot would have been the all-consuming subject of national debate for days or even weeks, with Blair on the rack.
  • (18) Over the next few years, he racked up a series of successful expeditions to peaks in the Himalayas and elsewhere, including in 1983 the first ascent of the south face of Annapurna II, just shy of 8,000m.
  • (19) Utensil drying racks were found in 56.0% of the households.
  • (20) A film based on a smutty book that now litters the racks of every last charity shop.

Shelf


Definition:

  • (v. i.) A flat tablet or ledge of any material set horizontally at a distance from the floor, to hold objects of use or ornament.
  • (v. i.) A sand bank in the sea, or a rock, or ledge of rocks, rendering the water shallow, and dangerous to ships.
  • (v. i.) A stratum lying in a very even manner; a flat, projecting layer of rock.
  • (v. i.) A piece of timber running the whole length of a vessel inside the timberheads.

Example Sentences:

  • (1) Since he was created, he has appeared at several robotic fairs across China, but spends most of his time in deep meditation on an office shelf in Longquan.
  • (2) Matches on the NDCD tape could be found for 80% of the items in the shelf stock sample and 69.5% of the items in the tape supplied by the wholesaler.
  • (3) The development of the hydrogelic occlusive device called the P-block is described including developmental steps of the design of the device as well as the experience gained concerning the hydrogel of the device, shelf life, animal and human toxicology, insertion techniques, analgesia, check-up for retention in situ, actual efficacy of the method, mode of action of the device, complication rates, patient acceptance, continuation rates, possible reversibility and future perspectives of the method.
  • (4) Formulation often has a dramatic effect on degradation of proteins during the freeze-drying process as well as impacting on the "shelf-life" stability of the freeze-dried product.
  • (5) The determination of potency or shelf life, impurity limit testing, and study of reaction mechanisms are considered as different aspects of drug stability.
  • (6) Patterns of HA distribution in anterior, posterior and presumptive soft palate were examined in the secondary palatal shelves of CD-1 mouse fetuses that were 30, 24 and 18 h prior to, and at the time of, shelf reorientation.
  • (7) Another pint of Guinness That evening we set out again, this time to O'Donoghue's in Fanore, a blue-painted stone pub set on the thin shelf of land between the sea and the great limestone mountain that is called the Burren.
  • (8) The absence of membrane proteins and chemical stability of SFH and phospholipids promises long shelf-life.
  • (9) So, they start to create these almost fictitious things they can sell, whether it’s a prime shelf [at the height a shopper is most likely to see] or a gondola end [the promotional buckets often found at the top of the aisle].
  • (10) Midline epithelial cells cease DNA synthesis 24-36 h before shelf elevation and contact, become active in the synthesis of cell surface glycoproteins, and subsequently manifest morphological signs of necrosis.
  • (11) It has been suggested that head posture changes, tongue movements and jaw opening reflexes are required to enable palatal shelf elevation to occur in normal cranio-facial development.
  • (12) Allografts are often freeze dried to increase shelf storage time and sterilized with ethylene oxide.
  • (13) The shelf procedure provides a buttress of bone for later reconstructive surgery such as cup or total hip arthroplasty.
  • (14) When tested in another task (recovering food pellets from a horizontal shelf accessible through a narrow slit below the ceiling of the test box) same rats displayed identical (45%) and opposite (15%) preference or were ambidextrous (40%).
  • (15) In one case this was a dense shelf-like mass of echoes extending downward from the basal portion of the interventricular septum toward the mid-portion of the anterior mitral leaflet with corresponding systolic anterior motion of the mitral leaflet.
  • (16) Eight brands of composite resin, including paste-paste, powder-liquid and light-activated systems, as well as three glass ionomer cements were evaluated over a period of twelve months with respect to shelf-life and suitability for use in a tropical environment.
  • (17) They know that you're just going to buy everything from Amazon now, so they've all cut their losses and stacked every shelf with a trillion different 50 Shades Of Grey knock-offs called things like Disciplined With Buttplugs and 20 Carat Strumpet.
  • (18) The shelf life of the solid phase presensitized with monoclonal antibodies was 4 mth at -15 degrees C. DEN prototype viruses were still identified after storage at -15 degrees C for 1 yr or at room temperature for 1 mth.
  • (19) There are now standard off-the-shelf products that provide the kind of digital production tools that simply didn't exist five years ago.
  • (20) It is concluded that the shelf life of iced whole cod can be predicted using this model but not that of vacuum-packed fillets because of the greater variability of bacterial activity in packaged fish.