-th

-th ¹

suff.

Variant of -eth¹.

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-th ²

suff.

1. Act; process: spilth.

2. State; quality: dearth.

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[Middle English, from Old English -thu, n. suff.]

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-th ³

also -eth

suff.

Used to form ordinal numbers: millionth.

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[Middle English -the, from Old English -tha, -the.]

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.

-th

suffix forming nouns

1. (from verbs) indicating an action or its consequence: growth.

2. (from adjectives) indicating a quality: width.

[from Old English -thu, -tho]

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-th

or

-eth

suffix

(Mathematics) forming ordinal numbers: fourth; thousandth.

[from Old English -( o)tha, -( o)the]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Th

Chem. Symbol.

thorium.

-th¹

,

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

[Middle English -th(e), Old English -thu, -tho, -th (variant -t after a velar, f, or s), c. Gothic -itha, Latin -tus, Greek -tos]

-th²

,

a suffix used in the formation of ordinal numbers: fourth; tenth.

[Middle English -the, -te, Old English -tha, -the (variant -ta after f or s), c. Old Norse -thi, -di, Latin -tus, Greek -tos; compare -eth²]

-th³

,

var. of -eth¹: doth.

Th.

Thursday.

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.