acoustical door[ə′küs·tə·kəl ′dȯr]
A solid door with gasketing along the top and sides, and usually an automatic door bottom, designed to reduce noise transmission.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A door having a sound-deadening core, stops along the top and sides sealed by gaskets, and an automatic drop seal along the bottom; especially constructed to reduce noise transmission through it. See also: Door
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A solid, heavy door which is gasketed along the top and sides; usually has an automatic door bottom; especially constructed to reduce noise transmission through it; usually carries a sound transmission class (STC) rating, which is a measure of its sound insulation value.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.