Top-shell
Top-shell Top"-shell`, n. (Zo["o]l.) Any one of numerous species of marine top-shaped shells of the genus {Trochus}, or family {Trochid[ae]}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • top shell — noun 1. : any of various marine snails constituting the family Trochidae and having a spiral and usually regularly conical shell marked by a flat base and rhombic aperture and a multispiral operculum and sometimes used to make pearl buttons 2. :… …   Useful english dictionary

  • top shell — ▪ gastropod family       any marine snail of the family Trochidae (subclass Prosobranchia, class Gastropoda), characterized by a spiral, conical shell. Although top shells are found from the intertidal zone to the deep open seas, they occur with… …   Universalium

  • top shell — noun a marine mollusc having a low conical shell with a pearly interior. [Family Trochidae.] …   English new terms dictionary

  • Zebra top shell — Taxobox name = Zebra top shell image caption = regnum = Animalia phylum = Mollusca classis = Gastropoda ordo = Archaeogastropoda familia = Trochidae genus = Austrocochlea species = A. porcata binomial = Austrocochlea porcata binomial authority =… …   Wikipedia

  • Top Tier Detergent Gasoline — is a designation given to participating gas brands in the U.S. and Canada that meet voluntary industry standards. History The U.S. Environmental Protection Agency (EPA) introduced the minimum gasoline detergent standard [… …   Wikipedia

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