noun Dentistry.
eruption of the deciduous teeth, especially the phenomena associated with their eruption.

1725–35; teethe + -ing1

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verb (used without object), teethed, teething.
to grow teeth; cut one's teeth.

1375–1425; late Middle English tethen, derivative of teth teeth

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
teethe (tiːð)
(intr) to cut one's baby (deciduous) teeth

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1410, probably from an unrecorded O.E. verb *teþan, from toþ (see tooth). Teething is attested from 1732.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

teething teeth·ing (tē'ðĭng)
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.
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Example sentences
Also, for many carmakers this is a new technology and there will be teething
The shallows lapped from different directions at the tree as if almost teething
  on it.
Radical redesigns can have lots of teething troubles that spoil a customer's
  bottom line.
Teething problems with the engines should not have been a surprise.
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