bivalve
adj.
1660s in reference to mollusks with double shells; 1670s in reference to shutters or doors; from bi- + valve. The noun is 1680s in the mollusk sense.
| 词汇 | bivalve | 
| 词根词缀 | Online Etymology Dictionary bivalve adj. 1660s in reference to mollusks with double shells; 1670s in reference to shutters or doors; from bi- + valve. The noun is 1680s in the mollusk sense. | 
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