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ammocete

or am·mo·coete

[am-uh-seet]
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noun
  1. the larval stage of a lamprey.
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Origin of ammocete

1855–60; < New Latin ammocoetes literally, something bedded in sand < Greek ámmo(s) sand + koítē bed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ammocoete

ammocoete

noun
  1. the larva of primitive jawless vertebrates, such as the lamprey, that lives buried in mud and feeds on microorganisms
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Word Origin

C19: from New Latin ammocoeteēs, literally: that lie in sand, from Greek ammos sand + koitē bed, from keisthai to lie
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012