aneroid diaphragm

aneroid diaphragm

[′an·ə‚rȯid ′di·ə‚fram]
(engineering)
A thin plate, usually metal, covering the end of an aneroid capsule and moving axially as the ambient gas pressure increases or decreases.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.