/ Dictionary / Index T Tay: Meaning and Definition of Find definitions for: Tay Pronunciation: (tā), [key] — n. a river flowing through central Scotland into the Firth of Tay. 118 mi. (190 km) long. an estuary of the North Sea, off the coast of central Scotland. 25 mi. (40 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tay (Thesaurus) -taxy Taylor Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language