tit

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various small insectivorous songbirds of the family Paridae of woodland areas, especially those of Eurasia and Africa.
• noun Any of various similar birds.
• noun Vulgar Slang A woman's breast.
• noun A teat.

from The Century Dictionary.

• noun One of several small birds.
• noun In mech., a round projection on a tool or other piece to serve as a guide. A tit is usually made on the end of a counterbore, so that the hole made by it shall be concentric with the hole which it is desired to enlarge.
• noun A small or poor horse.
• noun A child; a girl; a young woman: a depreciatory term.
• noun A bit; morsel.
• noun An abbreviation of title; [capitalized] of Titus (a book of the New Testament).
• noun A teat. See teat.
• To pull tightly.
• noun In the phrase tit for tat (literally, in the original form tip for tap, ‘blow for blow’), a retaliatory return; an equivalent by way of repartee or answer: as, to give a person tit for tat in a dispute or a war of wit.
• noun A pull.
• A Middle English variant of tite.

from the GNU version of the Collaborative International Dictionary of English.

• noun A small horse.
• noun A woman; -- used in contempt.
• noun A morsel; a bit.
• noun Any one of numerous species of small singing birds belonging to the families Paridæ and Leiotrichidæ; a titmouse.
• noun The European meadow pipit; a titlark.
• noun (Zoöl.) See Wren tit, under Wren.
• noun (Zoöl.) any one of numerous species of Asiatic singing birds belonging to Siva, Milna, and allied genera.
• noun (Zoöl.) any one of several species of small East Indian and Asiatic timaline birds of the genus Trichastoma.
• noun An equivalent; retaliation.
• noun (Zoöl.) any one of numerous species of Asiatic and East Indian birds belonging to Suthora and allied genera. In some respects they are intermediate between the thrushes and titmice.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun archaic A light blow or hit (now usually in phrase tit for tat).
• noun A small passerine bird of the genus Parus or the family Paridae, common in the northern hemisphere.
• noun Any of various other small passerine birds.
• noun archaic A small horse; a nag.
• noun archaic A young girl, later especially a minx, hussy.
• noun A mammary gland, teat.
• noun slang, vulgar A woman's breast.
• noun UK, pejorative, slang An idiot; a fool.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun either of two soft fleshy milk-secreting glandular organs on the chest of a woman
• noun small insectivorous birds
• noun the small projection of a mammary gland