- spirogyrate
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adj. [L. spira, coil; gyratus, circular](MOLLUSCA: Bivalvia)1. Umbones coiled outward from the saggital plane.2. In oysters, having the beak in a distinct spiral.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
