egg tooth


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egg tooth

n.
A hard toothlike projection on the beak of an embryonic bird or the snout of an embryonic reptile that is used to break through the eggshell upon hatching and that later falls off or is absorbed.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

egg tooth

n
(Zoology) (in embryo birds and reptiles) a temporary tooth or (in birds) projection of the beak used for piercing the eggshell
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

egg′ tooth`


n.
a calcareous prominence at the tip of the beak or upper jaw of an embryonic bird or reptile, used to break through the eggshell at hatching.
[1890–95]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

egg tooth

A hard, tooth-like projection from the beak of embryonic birds, or from the upper jaw of embryonic reptiles, that is used to cut the egg membrane and shell upon hatching and that later falls off.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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During the two weeks, we learn about how they peck their way out of the shell with the egg tooth, how they feed and need to be kept warm.
"They use a special egg tooth to cut the shell open from inside - it's a bit like an in-built tin opener.
"They use a special egg tooth to cut the shell open from inside -- it's a bit like an in-built tin opener.