noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of various species of marine bivalve shells formerly belonging to the genus Avicula (no longer accepted), now a synonym of Pteria, with species assigned to several genera, in which the hinge border projects like a wing.
2. 2
   Any marine gastropod shell formerly in the genus Strombus, with species now assigned to several genera, principally in the family Strombidae.
3. 3
   Any pteropod shell. archaic

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.