The Collaborative International Dictionary of English v.0.48:

Concave \Con"cave\, v. t. [imp. & p. p. concaved; p. pr. & vb.
   n. Concaving.]
   To make hollow or concave.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Concaved \Con"caved\, a. (Her.)
   Bowed in the form of an arch; -- called also arched.
   [1913 Webster]