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The word oyster is used as a common name for a number of different families of saltwater clams, bivalve molluscs that live in marine or brackish habitats. In some species the valves are highly calcified, and many are somewhat irregular in shape. Many, but not all, oysters are in the superfamily Ostreoidea. Some kinds of oysters are commonly consumed, cooked or raw, by humans as a delicacy. Some kinds of pearl oysters are harvested for the pearl produced within the mantle. Windowpane oysters are harvested for their translucent shells, which are used to make various kinds of decorative objects. ==Etymology== First attested in English during the 14th century,〔(Oysters in Cynee ), Recipe for Oysters in Bread Sauce (Oysters in Cynee) from the 1390 English text, ''The Forme of Cury'', from Celtnet Recipes〕 the word "oyster" comes from Old French ''oistre'', in turn from Latin ''ostrea'', the feminine form of ''ostreum'',〔(ostrea, ostreum ), Charlton T. Lewis, Charles Short, ''A Latin Dictionary'', on Perseus〕 which is the latinisation of the Greek ὄστρεον (''ostreon''), "oyster".〔(ὄστρεον ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕 Compare ὀστέον (''osteon''), "bone".〔(ὀστέον ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oyster」の詳細全文を読む スポンサード リンク
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