What's the difference between island and seagirt?

Island

Definition:

(n.) A tract of land surrounded by water, and smaller than a continent. Cf. Continent.
(n.) Anything regarded as resembling an island; as, an island of ice.
(n.) See Isle, n., 2.
(v. t.) To cause to become or to resemble an island; to make an island or islands of; to isle.
(v. t.) To furnish with an island or with islands; as, to island the deep.

Example Sentences:

(1) On Friday night, in a stadium built in an area once deemed an urban wasteland, the flame that has journeyed from Athens to every corner of these islands will light the fire that launches the London Olympics of 2012.
(2) If Charles Spencer, 3rd Duke of Marlborough, who bought the island in 1738, were to return today he would doubtless recognise the scene, though he might be surprised that his small private buildings have grown into a sizable hotel.
(3) Given Australia’s number one position as the worst carbon emitter per capita among major western nations it seems hardly surprising that islanders from Fiji, Samoa, Vanuatu and other small island developing states have been turning to Australia with growing exasperation demanding the country demonstrate an appropriate response and responsibility.
(4) Photograph: Guardian The research also compiled data covered by a wider definition of tax haven, including onshore jurisdictions such as the US state of Delaware – accused by the Cayman islands of playing "faster and looser" even than offshore jurisdictions – and the Republic of Ireland, which has come under sustained pressure from other EU states to reform its own low-tax, light-tough, regulatory environment.
(5) A full-scale war is unlikely but there is clear concern in Seoul about the more realistic threat of a small-scale attack on the South Korean military or a group of islands near the countries' disputed maritime border in the Yellow Sea.
(6) The matter is now in the hands of the Guernsey police and the law officers.” One resident who is a constant target of the paper and has complained to police, Rosie Guille, said the allegations had a “huge impact on morale” on the island.
(7) Relative to the perceived severity of their asthma, both Maoris and Pacific Islanders lost more time from work or school and used hospital services more than European asthmatics using A & E. The increased use of A & E by Maori and Pacific Island asthmatics seemed not attributable to the intrinsic severity of their asthma and was better explained by ethnic, socioeconomic and sociocultural factors.
(8) A programme is described in which indigenous personnel are trained to provide culturally appropriate rehabilitation services for islanders of the Pacific Basin.
(9) Stimuli presented to this island could be detected and discriminated, although the subject reported he did not see them.
(10) Tepco has taken on a US consultant, Lake Barrett , who led the NRC's cleanup of Three Mile Island, the worst commercial nuclear power accident in the nation's history.
(11) Features of barrier island physiography and ecology were studied relative to selective bait deployment and site biosecurity.
(12) In a second phase of the study, a comparison was made between mortality rates of male and female progeny of White Leghorn-Rhode Island Red reciprocal crosses.
(13) Hospital discharge summary data were used to identify and study all 2,870 Rhode Island residents hospitalized in-state with head injuries during 1979 and 1980.
(14) The arrival on Monday was another first for the two countries since Barack Obama and Cuban President Raúl Castro announced a historic rapprochement in December 2014, and comes weeks after Obama’s visit to the Caribbean island.
(15) A fortnight ago the two countries signed a US$27 million deal to tackle deforestation on the island of Sumatra - a key problem in Indonesia where 80 per cent of emissions come from deforestation, both by legal and illegal loggers.
(16) There was an upstream "HTF" island (Hpa II tiny fragments) followed by four direct repeats of the "chorion box" enhancer.
(17) They’ve already collaborated with folks like DOOM, Ghostface Killah and Frank Ocean; I was lucky enough to hear a sneak peek of their incredible collaboration with Future Islands’ Sam Herring from their forthcoming album.
(18) In Tokyo, the US president warned China against forcibly pressing its maritime claims, following Beijing's unilateral declaration last autumn of an air exclusion zone over Japanese-controlled islands in the East China Sea.
(19) Nicholas Shaxson – the author of Treasure Islands, a book about the world of tax evasion – described the demands as "incredibly powerful".
(20) The Rhode Island Democrat got his start in national politics in 1999 when he was appointed to the Senate as a Republican after his father’s death.