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Symbol, Chemistry.
  1. thorium.


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

Origin of -th1

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


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

Origin of -th2

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


  1. variant of -eth1: doth.


  1. Thursday.


  1. Territory of Hawaii.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for th

Contemporary Examples

Historical Examples

  • He's a sawhorse—he's as heavy in th' head as a bag of salt; he'll never do no good to nobody.


    W. A. Fraser

  • I wanth t' get t' the Thouthern outporth, where there'th life.

  • I ain't got none, but th' blacksmith'll fit you out all right.

    The Forest

    Stewart Edward White

  • Come, Thaney gal, we'll go in th' house 'n' find pappy 'n' gra'mammy.

  • Will ye come in th' parlor, er had ye ruther set out on th' piazza?

British Dictionary definitions for th


the internet domain name for
  1. Thailand


the chemical symbol for
  1. thorium


suffix forming nouns
  1. (from verbs) indicating an action or its consequencegrowth
  2. (from adjectives) indicating a qualitywidth

Word Origin

from Old English -thu, -tho



  1. forming ordinal numbersfourth; thousandth

Word Origin

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

A sound found chiefly in words of Old English, Old Norse or Greek origin, unpronounceable by Normans and many other Europeans. In Greek, the sound corresponds etymologically to Sanskrit -dh- and English -d-; and it was represented graphically by -TH- and at first pronounced as a true aspirate (as still in English outhouse, shithead, etc.). But by 2c. B.C.E. the Greek letter theta was in universal use and had the modern "-th-" sound. Latin had neither the letter nor the sound, however, and the Romans represented Greek theta by -TH-, which they generally pronounced, at least in Late Latin, as simple "-t-" (passed down to Romanic languages, e.g. Spanish termal "thermal," teoria "theory," teatro "theater").

In Germanic languages it represents PIE -t- and was common at the start of words or after stressed vowels. To represent it, Old English and Old Norse used the characters ð "eth" (a modified form of -d-) and þ "thorn," which originally was a rune. Old English, unlike Old Norse, seems never to have standardized which of the two versions of the sound ("hard" and "soft") was represented by which of the two letters.

The digraph -th- sometimes appears in early Old English, on the Roman model, and it returned in Middle English with the French scribes, driving out eth by c.1250, but thorn persisted, especially in demonstratives (þat, þe, þis, etc.), even as other words were being spelled with -th-. The advent of printing dealt its death-blow, however, as types were imported from continental founders, who had no thorn. For a time y was used in its place (especially in Scotland), because it had a similar shape, hence ye for the in historical tourist trap olde shoppes (it never was pronounced "ye," only spelled that way).

The awareness that some Latin words in t- were from Greek th- encouraged over-correction in English and created unetymological forms such as Thames and author, while some words borrowed from Romanic languages preserve, on the Roman model, the Greek -th- spelling but the simple Latin "t" pronunciation (e.g. Thomas and thyme).



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").



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).

Online Etymology Dictionary, © 2010 Douglas Harper

th in Medicine


  1. The symbol for the elementthorium

th in Science


  1. The symbol for thorium.


  1. A silvery-white, radioactive metallic element of the actinide series. It is used for fuel in some nuclear reactors and for improving the high-temperature strength of magnesium alloys. The only naturally occurring isotope of thorium, Th 232, is also its most stable, having a half-life of 14.1 billion years. Atomic number 90; atomic weight 232.038; approximate melting point 1,750°C; approximate boiling point 4,500°C; approximate specific gravity 11.7; valence 4. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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