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-th

1
  1. a suffix forming nouns of action (birth) or abstract nouns denoting quality or condition (depth; length; warmth).
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Origin of -th

1
Middle English -th(e), Old English -thu, -tho, -th (variant -t after a velar, f, or s); cognate with Gothic -itha, Latin -tus, Greek -tos

-th

2
  1. a suffix used in the formation of ordinal numbers (fourth, tenth), in some cases, added to altered stems of the cardinal (fifth; twelfth).
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Origin of -th

2
Middle English -the, -te, Old English -tha, -the (variant -ta after f or s); cognate with Old Norse -thi, -di, Latin -tus, Greek -tos; see -eth2

-th

3
  1. variant of -eth1: doth.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -th

-th

1
suffix forming nouns
  1. (from verbs) indicating an action or its consequencegrowth
  2. (from adjectives) indicating a qualitywidth
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Word Origin for -th

from Old English -thu, -tho

-th

2

-eth

suffix
  1. forming ordinal numbersfourth; thousandth
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Word Origin for -th

from Old English -(o) tha, -(o) the
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 -th

2

suffix forming nouns (e.g. depth, strength, truth, etc.), from Old English -ðu, , from Proto-Germanic *-itho, abstract noun suffix, from PIE *-ita (cf. Sanskrit -tati-; Greek -tet-; Latin -tati-, as in libertatem "liberty" from liber "free").

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1

word-forming element making ordinal numbers (fourth, tenth, etc.), Old English -ða, from Proto-Germanic *-tha-, from PIE *-to-, also *-eto-, *-oto-, suffix forming adjectives "marking the accomplishment of the notion of the base" [Watkins] (cf. Sanskrit thah, Greek -tos, Latin -tus).

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Online Etymology Dictionary, © 2010 Douglas Harper