Con″cave, n. [L. concavum.] 1. A hollow; an arched vault; a cavity; a recess.
Up to the fiery concave towering hight.
Milton.
2. (Mech.) A curved sheath or breasting for a revolving cylinder or roll.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.