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oyster

oyster,bivalve mollusk found in beds in shallow, warm waters of all oceans. The shell is made up of two valves, the upper one flat and the lower convex, with variable outlines and a rough outer surface. Since the wild oyster spends most of its life (except for the free-swimming larval stage) attached—having fused its valve with a sticky substance to a substratum of shells, rocks, or roots—the foot is rudimentary.

In some species the sexes are separate and the eggs are laid and fertilized in the water; in others the animal is hermaphroditic and the eggs are retained with the shell. Only a small proportion of the millions of eggs laid survive. Large numbers of the free-swimming larvae, called veligers, are consumed by fish and other animals. After the oyster becomes sessile, it may be victimized by oyster drills, starfish, and other enemies.

Edible oysters belong to the family Ostreidae, the true oysters. The eastern oyster, Crassostrea virginica, reaches a length of 4 to 6 in. (10–15 cm). These oysters are harvested in artificial beds on both coasts of the United States: on the Atlantic especially in the regions of the Delaware and Chesapeake bays and in the waters off Long Island, in the Gulf Coast off Louisiana, and in the Pacific off the state of Washington. Prepared beds are usually seeded with veligers or young sessile oysters called spats. In warm waters they mature in 11/2 years; in cooler waters the period of growth is about 4 to 5 years. They are usually transplanted several times before harvest to enhance their food supply and stimulate growth. Oysters are also farmed in mesh cages, trays, and bags (which may have floats incorporated), on ropes to which they have been attached, or in special tanks. The Pacific oyster, C. gigas, native to the coast of Asia and farmed there, also is farmed in the U.S. Northwest, Europe, and Australia and New Zealand. The edible oysters of the genus Ostrea, such as the Belon and Olympia oysters, are less significant commercially than they once were, due to overharvesting and disease.

The wing and the pearl oysters, of the family Pteriidae, are widespread in warmer seas; there is one eastern and one western species of each in American waters. The great pearl oyster, from which the pearl is obtained, is a large (12-in./30.5-cm) tropical species. The familiar jingle shells, delicate, shiny orange or yellow shells common on beaches, belong to the same order as the oyster.

Oysters are classified in the phylum Mollusca, class Pelecypoda or Bivalvia.

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"oyster." The Columbia Encyclopedia, 6th ed.. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/oyster

oyster

oys·ter / ˈoistər/ • n. 1. any of a number of bivalve mollusks with rough irregular shells. Several kinds are eaten (esp. raw) as a delicacy and may be farmed for food or pearls, in particular: ∎  a true oyster (family Ostreidae), including the edible American oyster (Crassostrea virginica). ∎  a similar bivalve of another family, esp. the thorny oysters (Spondylidae), wing oysters (Pteriidae), and saddle oysters (Anomiidae). 2. an oyster-shaped morsel of meat on each side of the backbone in poultry. 3. (also oyster white) a shade of grayish white. • v. [intr.] raise, dredge, or gather oysters. • adj. of the color oyster white. PHRASES: the world is your oyster you are in a position to take the opportunities that life has to offer. ORIGIN: Middle English: from Old French oistre, via Latin from Greek ostreon; related to osteon ‘bone’ and ostrakon ‘shell or tile.’

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oyster

oyster Marine bivalve mollusc, Ostreidae and Crassostrea spp. One dozen oysters (120 g of the edible portion) are an exceptionally rich source of vitamin B12; a rich source of iron, iodine, selenium, and vitamin D; a good source of protein and niacin; a source of vitamins A, B1, and B2, and supply 85 kcal (360 kJ).

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oyster

oyster taken proverbially as the type of someone who is reserved and uncommunicative.
don't eat oysters unless there is an R in the month from the tradition that oysters were likely to be unsafe to eat in the warmer months between May and August.

See also the world is one's oyster.

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oyster

oyster Edible bivalve mollusc found worldwide in temperate and warm seas. The European flat, or edible, oyster Ostrea edulis occurs throughout coastal waters. The pearl oyster (Pinctada fucats) produces cultured pearls.

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oyster

oyster XIV. ME. oistre — OF. oistre, uistre (mod. huitre) — L. ostrea (whence also OE. ostre), also ostreum — Gr. óstreon, rel. to ostéon bone.

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"oyster." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 21 Aug. 2017 <http://www.encyclopedia.com>.

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oyster

oysterexploiter, goitre (US goiter), loiter, reconnoitre (US reconnoiter), Reuter •anointer, appointer, jointer, pointer •cloister, hoister, oyster, roister •accoutre (US accouter), commuter, computer, disputer, hooter, looter, neuter, pewter, polluter, recruiter, refuter, rooter, saluter, scooter, shooter, souter, suitor, tooter, transmuter, tutor, uprooter •booster, rooster •doomster • freebooter • sharpshooter •peashooter • six-shooter •troubleshooter • prosecutor •persecutor • prostitutor •telecommuter •footer, putter •Gupta • Worcester • Münster •pussyfooter • executor •contributor, distributor •collocutor, interlocutor •abutter, aflutter, butter, Calcutta, clutter, constructor, cutter, flutter, gutter, mutter, nutter, scutter, shutter, splutter, sputter, strutter, stutter, utter •abductor, conductor, destructor, instructor, obstructor •insulter •Arunta, Bunter, chunter, Grantha, grunter, Gunter, hunter, junta, punter, shunter •corrupter, disrupter, interrupter •sculptor •adjuster, Augusta, bluster, buster, cluster, Custer, duster, fluster, lustre (US luster), muster, thruster, truster •huckster • Ulster • dumpster •funster, Munster, punster •funkster, youngster •gangbuster • filibuster • blockbuster •semiconductor • headhunter •woodcutter •lacklustre (US lackluster)

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