资料来源 : pyDict

两凹的,两面凹洼的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Concavo-concave \Con*ca`vo-con"cave\, a.
   Concave or hollow on both sides; double concave.

资料来源 : WordNet®

concavo-concave
     adj : concave on both sides [syn: {biconcave}]