| fissurella | (n) type genus of the family Fissurellidae: keyhole limpets, Syn. genus Fissurella |
| keyhole limpet | (n) marine limpet having a conical shell with an opening at the apex, Syn. Diodora apertura, Fissurella apertura |
| Fissurella | ‖n. [ NL., dim. of L. fissura a fissure. ] (Zool.) A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also |