The Collaborative International Dictionary of English v.0.48:
neritid \neritid\ n. An operculate seasnail of coastal waters with a short spiral shell. Syn: neritid gastropod. [WordNet 1.5]WordNet (r) 3.0 (2006):
neritid n 1: operculate seasnail of coastal waters with a short spiral shell [syn: neritid, neritid gastropod]