toothshell

from The Century Dictionary.

• noun Any member of the genus Dentalium, family Dentaliidæ, order Solenoconchæ, or class Scaphopoda.
• noun A small marine mollusk, Marinula pellucida, whose shell is used in Australia for necklaces. E. E. Morris, Austral English.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) Any species of Dentalium and allied genera having a tooth-shaped shell. See dentalium.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative form of tooth shell.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of various seashore mollusks having a tapering tubular shell open at each end and a foot pointed like a spade for burrowing