crown weir[′krau̇n ‚wer]
The highest point on the internal bottom surface of the crown of a plumbing trap.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
crown, 9.On the internal surface of a trap for a plumbing fixture, the highest point of the bottom surface at the
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.