/ Dictionary / Index W weir: Meaning and Definition of Find definitions for: weir Pronunciation: (wēr), [key] a small dam in a river or stream. a fence, as of brush or narrow boards, or a net set in a stream, channel, etc., for catching fish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: weir (Thesaurus) Weingartner weird Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language