Etymology
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univalve

of mollusks and shells, 1660s (noun and adjective), from uni- + valve.

updated on February 27, 2014

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Definitions of univalve from WordNet
1
univalve (n.)
a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes;
Synonyms: gastropod
2
univalve (adj.)
used of mollusks, especially gastropods, as snails etc.;
From wordnet.princeton.edu, not affiliated with etymonline.