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The Collaborative International Dictionary
Divaricator

Divaricator \Di*var`i*ca"tor\, n. (Zo["o]l.) One of the muscles which open the shell of brachiopods; a cardinal muscle. See Illust. of Brachiopoda.

Wiktionary
divaricator

n. (context zoology English) One of the muscles that open the shell of a brachiopod; a cardinal muscle.