Hypertext Webster Gateway: "biconcave"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Biconcave \Bi*con"cave\, a. [Pref. bi- + concave.]
Concave on both sides; as, biconcave vertebr[ae].
From WordNet (r) 1.7 (wn)
biconcave
adj : concave on both sides [syn: {concavo-concave}]
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