Any of several species of conical gastropod shells in the family Trochidae and genus Astraea in family Turbinidae, the margin of the shells being toothed somewhat like the rowel of a spur.

Any species of Pleurotomaria, a genus of pearly spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas.

plural of slit-shell

plural of tusk shell

present participle of shell shock

plural of shell shock

Third-person singular simple present indicative form of shell shock

present participle of shell-shock

Third-person singular simple present indicative form of shell-shock

A small bivalve shell of the genus Ervilia.