Etymology
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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, as in 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 Ye Olde _______ Shoppe (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 (as in Thomas and thyme).

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Definitions of th
1
th (adj.)
the ordinal number of forty-seven in counting order;
Synonyms: forty-seventh
th (adj.)
the ordinal number of thirty-four in counting order;
Synonyms: thirty-fourth
th (adj.)
the ordinal number of forty-eight in counting order;
Synonyms: forty-eighth
th (adj.)
the ordinal number of thirty-five in counting order;
Synonyms: thirty-fifth
th (adj.)
the ordinal number of one hundred thirty-five in counting order;
Synonyms: hundred-and-thirty-fifth
th (adj.)
the ordinal number of forty-nine in counting order;
Synonyms: forty-ninth
th (adj.)
the ordinal number of thirty-six in counting order;
Synonyms: thirty-sixth
th (adj.)
coming next after the ninth and just before the eleventh in position;
Synonyms: tenth
th (adj.)
the ordinal number of one hundred ten in counting order;
Synonyms: hundred-and-tenth
th (adj.)
the ordinal number of thirty-seven in counting order;
Synonyms: thirty-seventh
th (adj.)
coming next after the twenty-third in position;
Synonyms: twenty-fourth
th (adj.)
coming next after the tenth and just before the twelfth in position;
Synonyms: eleventh
th (adj.)
the ordinal number of one hundred twenty-five in counting order;
Synonyms: hundred-and-twenty-fifth
th (adj.)
the ordinal number of thirty-eight in counting order;
Synonyms: thirty-eighth
th (adj.)
coming next after the twenty-fourth in position;
Synonyms: twenty-fifth
th (adj.)
coming next after the eleventh and just before the thirteenth in position;
Synonyms: twelfth
th (adj.)
the ordinal number of thirty-nine in counting order;
Synonyms: thirty-ninth
th (adj.)
coming next after the twenty-fifth in position;
Synonyms: twenty-sixth
th (adj.)
coming next after the twelfth in position;
Synonyms: thirteenth
th (adj.)
the ordinal number of one hundred in counting order;
Synonyms: hundredth / centesimal
th (adj.)
coming next after the twenty-sixth in position;
Synonyms: twenty-seventh
th (adj.)
coming next after the thirteenth in position;
Synonyms: fourteenth
th (adj.)
the ordinal number of one hundred fifteen in counting order;
Synonyms: hundred-and-fifteenth
th (adj.)
coming next after the twenty-seventh in position;
Synonyms: twenty-eighth
th (adj.)
coming next after the fourteenth and just before the sixteenth in position;
Synonyms: fifteenth
th (adj.)
coming next after the twenty-eighth in position;
Synonyms: twenty-ninth
th (adj.)
coming next after the fifteenth in position;
Synonyms: sixteenth
th (adj.)
coming next after the sixteenth in position;
Synonyms: seventeenth
th (adj.)
the ordinal number of one hundred five in counting order;
Synonyms: hundred-and-fifth
th (adj.)
the ordinal number of one thousand in counting order;
Synonyms: thousandth
th (adj.)
coming next after the seventeenth in position;
Synonyms: eighteenth
th (adj.)
the ordinal number of two hundred in counting order;
Synonyms: two-hundredth
th (adj.)
the ordinal number of one hundred eighty-five in counting order;
Synonyms: hundred-and-ninetieth
th (adj.)
coming next after the eighteenth in position;
Synonyms: nineteenth
th (adj.)
the ordinal number of ninety in counting order;
Synonyms: ninetieth
th (adj.)
the ordinal number of one hundred eighty in counting order;
Synonyms: hundred-and-eightieth
th (adj.)
the ordinal number of eighty in counting order;
Synonyms: eightieth
th (adj.)
the ordinal number of ninety-five in counting order;
Synonyms: ninety-fifth
th (adj.)
the ordinal number of one hundred seventy in counting order;
Synonyms: hundred-and-seventieth
th (adj.)
the ordinal number of three hundred in counting order;
Synonyms: three-hundredth
th (adj.)
the ordinal number of seventy in counting order;
Synonyms: seventieth
th (adj.)
the ordinal number of eighty-five in counting order;
Synonyms: eighty-fifth
th (adj.)
the ordinal number of one hundred sixty in counting order;
Synonyms: hundred-and-sixtieth
th (adj.)
the ordinal number of sixty in counting order;
Synonyms: sixtieth
th (adj.)
coming next after the third and just before the fifth in position or time or degree or magnitude;
Synonyms: fourth / quaternary
th (adj.)
coming next after the fourth and just before the sixth in position;
Synonyms: fifth
th (adj.)
the ordinal number of seventy-five in counting order;
Synonyms: seventy-fifth
th (adj.)
the ordinal number of one hundred seventy-five in counting order;
Synonyms: hundred-and-seventy-fifth
th (adj.)
the ordinal number of four hundred in counting order;
Synonyms: four-hundredth
th (adj.)
the ordinal number of one hundred fifty in counting order;
Synonyms: hundred-and-fiftieth
th (adj.)
coming next after the fifth and just before the seventh in position;
Synonyms: sixth
th (adj.)
the ordinal number of fifty in counting order;
Synonyms: fiftieth
th (adj.)
coming next after the sixth and just before the eighth in position;
Synonyms: seventh
th (adj.)
the ordinal number of sixty-four in counting order;
Synonyms: sixty-fourth
th (adj.)
coming next after the seventh and just before the ninth in position;
Synonyms: eighth
th (adj.)
the ordinal number of sixty-five in counting order;
Synonyms: sixty-fifth
th (adj.)
the ordinal number of one hundred sixty-five in counting order;
Synonyms: hundred-and-sixty-fifth
th (adj.)
coming next after the eighth and just before the tenth in position;
Synonyms: ninth
th (adj.)
the ordinal number of forty in counting order;
Synonyms: fortieth
th (adj.)
the ordinal number of one hundred forty in counting order;
Synonyms: hundred-and-fortieth
th (adj.)
the ordinal number of fifty-five in counting order;
Synonyms: fifty-fifth
th (adj.)
the ordinal number of one hundred fifty-five in counting order;
Synonyms: hundred-and-fifty-fifth
th (adj.)
the ordinal number of five hundred in counting order;
Synonyms: five-hundredth
th (adj.)
coming next after the twenty-ninth in position;
Synonyms: thirtieth
th (adj.)
the ordinal number of one hundred thirty in counting order;
Synonyms: hundred-and-thirtieth
th (adj.)
the ordinal number of forty-four in counting order;
Synonyms: forty-fourth
th (adj.)
the ordinal number of forty-five in counting order;
Synonyms: forty-fifth
th (adj.)
the ordinal number of one hundred forty-five in counting order;
Synonyms: hundred-and-forty-fifth
th (adj.)
the ordinal number of forty-six in counting order;
Synonyms: forty-sixth
th (adj.)
coming next after the nineteenth in position;
Synonyms: twentieth
th (adj.)
the ordinal number of one hundred twenty in counting order;
Synonyms: hundred-and-twentieth
2
Th (n.)
the fifth day of the week; the fourth working day;
Synonyms: Thursday
Th (n.)
a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands;
Synonyms: thorium / atomic number "
From wordnet.princeton.edu