a. [ L. concavus; con- + cavus hollow: cf. F. concave. See Cave a hollow. ]
As concave . . . as a worm-eaten nut. Shak. [ 1913 Webster ]
v. t.
n. [ L. concavum. ]
Up to the fiery concave towering hight. Milton. [ 1913 Webster ]
a. (Her.) Bowed in the form of an arch; -- called also
n. Hollowness; concavity. [ 1913 Webster ]