What's the difference between guard and sentinel?

Guard


Definition:

  • (n.) To protect from danger; to secure against surprise, attack, or injury; to keep in safety; to defend; to shelter; to shield from surprise or attack; to protect by attendance; to accompany for protection; to care for.
  • (n.) To keep watch over, in order to prevent escape or restrain from acts of violence, or the like.
  • (n.) To protect the edge of, esp. with an ornamental border; hence, to face or ornament with lists, laces, etc.
  • (n.) To fasten by binding; to gird.
  • (v. i.) To watch by way of caution or defense; to be caution; to be in a state or position of defense or safety; as, careful persons guard against mistakes.
  • (v. t.) One who, or that which, guards from injury, danger, exposure, or attack; defense; protection.
  • (v. t.) A man, or body of men, stationed to protect or control a person or position; a watch; a sentinel.
  • (v. t.) One who has charge of a mail coach or a railway train; a conductor.
  • (v. t.) Any fixture or attachment designed to protect or secure against injury, soiling, or defacement, theft or loss
  • (v. t.) That part of a sword hilt which protects the hand.
  • (v. t.) Ornamental lace or hem protecting the edge of a garment.
  • (v. t.) A chain or cord for fastening a watch to one's person or dress.
  • (v. t.) A fence or rail to prevent falling from the deck of a vessel.
  • (v. t.) An extension of the deck of a vessel beyond the hull; esp., in side-wheel steam vessels, the framework of strong timbers, which curves out on each side beyond the paddle wheel, and protects it and the shaft against collision.
  • (v. t.) A plate of metal, beneath the stock, or the lock frame, of a gun or pistol, having a loop, called a bow, to protect the trigger.
  • (v. t.) An interleaved strip at the back, as in a scrap book, to guard against its breaking when filled.
  • (v. t.) A posture of defense in fencing, and in bayonet and saber exercise.
  • (v. t.) An expression or admission intended to secure against objections or censure.
  • (v. t.) Watch; heed; care; attention; as, to keep guard.
  • (v. t.) The fibrous sheath which covers the phragmacone of the Belemnites.

Example Sentences:

  • (1) Such margins would be enough to put the first female president in the White House, but Democrats are guarding against complacency.
  • (2) At the end of each session, he is forced to don a pair of blackened goggles, ear muffs are placed over his head, and he is ordered to place the palms of his hands together so that a guard can grasp his thumbs to lead him away.
  • (3) DNA-samples from HSV-infected and uninfected Vero cells have been examined concurrently to provide standard "HSV-positive" and "HSV-negative" samples, the latter guarding also against false positives caused by cross-contamination.
  • (4) Merseyrail plans to operate trains without guards from 2020, although it has promised to redeploy staff.
  • (5) Sensitizing drugs must be strictly avoided to prevent such recurrences: their presence in drug mixtures must be guarded against.
  • (6) He joined the Coldstream Guards, while Debo and her mother went to Berne to collect Unity, who had put a bullet through her brain but survived, severely damaged; they coped with Unity's resultant moodiness and incontinence through the first year of war.
  • (7) Diego Garcia guards its secrets even as the truth on CIA torture emerges Read more The long-awaited decision – expected to cause enormous disappointment – follows more than 40 years of campaigning, court cases and calls for the UK to right a wrong committed by Harold Wilson’s Labour government.
  • (8) The Thunder now have a 2-0 series lead but can't afford to let their guard down considering they're about to face a wounded and fired up Kobe Bryant at home.
  • (9) What seems beyond doubt is that Koussa has long represented the old guard which for decades was close to Gaddafi, but which – if the Tripoli rumour mill is to be believed – has recently been pushed aside by Gaddafi's competing sons.
  • (10) "We have Revolutionary Guards who defied orders, though they were severely punished, expelled from the force and taken to prison," he says.
  • (11) Sample work-up consisted of addition of internal standard, filtration, then direct injection of the plasma sample onto an internal surface reversed-phase (ISRP) guard column where the dopamine agonist and internal standard were separated from plasma proteins.
  • (12) Yu Xiangzhen, former Red Guard Photograph: Dan Chung for the Guardian Almost half a century on, it floods back: the hope, the zeal, the carefree autumn days riding the rails with fellow teenagers.
  • (13) The checkpoints are a recipe for harassment and abuse.” Among other moves disclosed were plans to hire 300 extra security guards to secure public transport in the city.
  • (14) I ask the Turkish guard to confirm that they will send a search-and-rescue team.
  • (15) On Tuesday, Romney had one event, a speech to the National Guard Association convention in Reno, Nev. And on the day before that, another single rally, in Mansfield, Ohio.
  • (16) The young woman is Nobel Peace Prize winner Ellen Johnson-Sirleaf, then part of the new guard of dissidents and critics, now the president of Liberia.
  • (17) Even when he’s going through the motions of politeness, he rarely lets his guard down.
  • (18) Three G4S guards were arrested on suspicion of manslaughter.
  • (19) Beatings with metal bars and cables were followed by so-called “security checks”, during which women in particular were subjected to rape and sexual assault by male guards.
  • (20) Typically, a local authority or someone with a large commercial property would pay six figures annually for security guards, CCTV, gates and other physical security.

Sentinel


Definition:

  • (n.) One who watches or guards; specifically (Mil.), a soldier set to guard an army, camp, or other place, from surprise, to observe the approach of danger, and give notice of it; a sentry.
  • (n.) Watch; guard.
  • (n.) A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.
  • (v. t.) To watch over like a sentinel.
  • (v. t.) To furnish with a sentinel; to place under the guard of a sentinel or sentinels.

Example Sentences:

  • (1) With Air Sentinels in the bedroom and living room for airborne collections, and a Sample Vac for collections from living room carpet and bedroom mattress, immunochemical quantifications of each were made with various radiometric assays with polyclonal and monoclonal antibodies.
  • (2) Similarly, in all three naturally infected sentinel chickens from Maryland, IgM class antibody was undetectable 1 to 5 weeks after IgM was initially detected.
  • (3) Ten sentinel pigs placed in the area all developed haemagglutination-inhibition antibodies against Japanese encephalitis and the virus was isolated from the blood of 3.
  • (4) Specific-pathogen-free leghorn sentinel chickens were vaccinated with Massachusetts (Mass) alone, Mass and JMK, or Mass and Arkansas (Ark) combination live vaccines, or they remained unvaccinated.
  • (5) BTV serotypes 11 and 17 were initially isolated from nearly all sentinel sheep, goats and dairy calves from late July through September, whereas isolates of 11 and 17 were made from only 2 beef cows and 2 deer in August and September.
  • (6) The numbers of females captured by both types of traps were significantly correlated with human sentinel collections.
  • (7) Contaminants were recovered from 10% of Isolator 10, 2.7% of Bactec, and 7.2% of Sentinel bottles.
  • (8) "Let me assure you that our brave sentinels on the border will address any issue that happens on the border," said the foreign ministry spokesman Syed Akbaruddin.
  • (9) The paper analyses 50 pairs of sera pre-elevated within the "sentinel" epidemiological surveillance in a population exposed to a high risk at a 2 months interval.
  • (10) It is more elaborate that the previously described selective biopsies and includes biopsy of all identifiable nodes in the inguinal region, including the sentinel node area.
  • (11) The Ambulatory Sentinel Practice Network (ASPN) conducted an observational study of pelvic inflammatory disease (PID) in the primary care setting.
  • (12) No MVE virus was isolated from these mosquitoes, but serum from one of the sentinel chickens contained MVE virus antibodies, indicating the presence of the virus in that region.
  • (13) Good folks and bad folks Sentinel spokeswoman Ann Marie Dryden said that the company is committed to helping the offenders it supervises fulfill the terms of their probation and leave the criminal justice system.
  • (14) Sentinel mice were housed in microisolator cages, exposed continuously to soiled bedding and bled at 21 and 42 days for serology.
  • (15) Seven further virus isolates from sentinel calves at Shambat (Khartoum) confirmed the presence of BTV serotypes 1, 4 and 16, and an untyped EHDV (designated 318) in the Sudan.
  • (16) Still, in interviews with home-state reporters Monday, Ryan denounced the idea of any Republican launching a third-party or independent candidacy to challenge Trump, telling the Milwaukee Journal-Sentinel it “would be a disaster for our party”.
  • (17) Splenectomized cattle and mature, spleen-intact cattle were used as sentinels in a 4-year study to assess the seasonality of naturally transmitted anaplasmosis.
  • (18) During heat shock and other forms of physiological stress, heat shock proteins act as intracellular sentinels to recognize malfolded proteins.
  • (19) Net egg production and numbers of larvae acquired by sentinel mice of each strain were monitored every two weeks.
  • (20) The Ambulatory Sentinel Practice Network (ASPN) undertook a 100% audit of 226 patients included in a study of spontaneous abortion (SAB).