teething

[tee-th ing]

Origin of teething

First recorded in 1725–35; teethe + -ing1

teethe

[teeth]
verb (used without object), teethed, teeth·ing.
  1. to grow teeth; cut one's teeth.

Origin of teethe

1375–1425; late Middle English tethen, derivative of teth teeth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for teething

teethe

verb
  1. (intr) to cut one's baby (deciduous) teeth
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

Word Origin and History for teething
n.

1724, verbal noun from teethe (v.).

teethe

v.

early 15c., probably from an unrecorded Old English verb *teþan, from toþ (see tooth). Related: Teethed; teething.

Online Etymology Dictionary, © 2010 Douglas Harper

teething in Medicine

teething

[tēðĭng]
n.
  1. The eruption or cutting of the teeth.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.