From ZooTerms (Dictionary of Invertebrate Zoology)
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divaricator (noun; Latin divaricatus, spread apart): 1. A muscle which causes parts to open.

2. (Brachiopoda) A muscle from the ventral valve to the cardinal process which opens the shell.

3. (Bryozoa) One of a pair of muscles which open the mandible for an avicularium or an operculum.