from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Concave on both surfaces; biconcave. Used of a lens.
from the GNU version of the Collaborative International Dictionary of English
- adj. Concave or hollow on both sides; double concave.
from The Century Dictionary and Cyclopedia
- Concave or hollow on both surfaces, as a lens. Lenses of this kind are more frequently termed double-concave lenses. See lens.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. concave on both sides
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