biconcave

bi·con·cave Audio Help (bī'kŏn-kāv', bī-kŏn'kāv')

adj. Concave on both sides or surfaces: a biconcave lens.
bi'con·cav'i·ty (-kāv'ĭ-tē) n.

(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.