CONCAVE

concave. Concave, a. hollow in the inside, arched

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Con″cave (kŏṉ‐kā‐v″ or kŏn″–; 277), a. [[L. concavus; con- + cavus hollow: cf. F. concave. See Cave a hollow.]] 1. 1. Hollow and curved or rounded; vaulted; — said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky.
2. 2. Hollow; void of contents.
As concave . . . as a worm-eaten nut. Shak.