Th

American Heritage® Dictionary of the English Language, Fourth Edition

1. The symbol for the element thorium.
2. abbr. Bible Thessalonians
3. abbr. Thursday.

Century Dictionary and Cyclopedia

1. n. In chem.: a symbol for thallium: better Tl.
2. n. A common English digraph. See T.
3. n. An abbreviation of Thursday.
4. n. In chem., the symbol for thorium.
5. n. A suffix used in forming abstract nouns from adjectives or verbs, as in health from whole or heal, stealth from steal, filth from foul, tilth from till, growth from grow, truth, troth, from true or trow, drouth from dry, highth from high, etc. It is little used as a modern formative, the more recent examples, like blouth, spilth, being chiefly poetical. The words in which it occurs are mostly old, and accordingly often differ somewhat, in their modern form, from the modern form of the original adjective or verb, as filth from foul, drouth from dry, etc. In many cases the relation of the noun in -th to its original verb is more remote, and is to be explained by the history of the particular word, as in death from the original form of die, ruth from rue, etc. In certain positions the -th becomes -t, and sometimes -d. Some modern forms in -t coexist with forms in -th, as drought, height, beside the now archaic drouth, highth; and in some -t has replaced the earlier -th, as in sight. In many nouns -th is of other, and often obscure, origin, as in north, south, both, etc.
6. n. A suffix (-eth after a vowel) used in forming ordinal from cardinal numerals, as in fourth, fifth, sixth, etc., twentieth, thirtieth, hundredth, thousandth, millionth, etc. It appears as -d in third, and was formerly -t in fift, sixt, etc., now fifth, sixth. etc. In first the suffix is the superlative -st. In eighth, pronounced as if spelled eightth, the radical t is anomalously omitted in spelling.
7. n. A suffix (in older form -eth) used in forming the third person singular (and in Middle English all persons plural) of the present indicative of verbs, as in singeth, hopeth, etc., or hath, doth, etc. It remains in archaic use, in poetical and scriptural language, the ordinary modern form being -s, -es, as in sings, hopes, has, does, etc. In Middle English and Anglo-Saxon use it was often contracted with a preceding radical d or t into -t, as fint for findeth, sit for siteth, sitteth, etc.

Wiktionary

1. n. chemistry Symbol for thorium.
2. n. Country code for Thailand.
3. n. Abbreviation of Thursday.
4. n. Abbreviation of Thessalonians.

GNU Webster's 1913

1. In Old English, the article the, when the following word began with a vowel, was often written with elision as if a part of the word. Thus in Chaucer, the forms thabsence, tharray, thegle, thend, thingot, etc., are found for the absence, the array, the eagle, the end, etc.

WordNet 3.0

1. n. the fifth day of the week; the fourth working day
2. 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