- (n.) A curved sheath or breasting for a revolving cylinder or roll.
- (v.t.) To make hollow or concave.
- (a.) Hollow; void of contents.
- (n.) A hollow; an arched vault; a cavity; a recess.
- (a.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). concave. Retrieved September 20, 2026, from http://smartdefine.org/concave/definitions/1989825 |
| Chicago | Webster's. 2011. "concave" http://smartdefine.org/concave/definitions/1989825 (accessed September 20, 2026). |
| Harvard | Webster's 2011, concave, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/concave/definitions/1989825>. |
| MLA | Webster's. "concave" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/concave/definitions/1989825> |