Concave

• POS: Adjective, Verb (transitive)
• HYPHEN: con=cave

CIDE DICTIONARY

Concave, a. [L. concavus; con- + cavus hollow: cf. F. concave. See Cave a hollow.].

•  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.  [1913 Webster]
•  Hollow; void of contents.  [1913 Webster]

  "As concave . . . as a worm-eaten nut."  [1913 Webster]

Concave, n. [L. concavum.].

•  A hollow; an arched vault; a cavity; a recess.  [1913 Webster]

  "Up to the fiery concave towering hight."  [1913 Webster]
•  A curved sheath or breasting for a revolving cylinder or roll.  [1913 Webster]

Concave, v. t. 

 To make hollow or concave.  [1913 Webster]

OXFORD DICTIONARY

Concave, adj. having an outline or surface curved like the interior of a circle or sphere (cf. convex).

Derivative

concavely adv. concavity n.

Etymology

L concavus (as com-, cavus hollow), or through F concave

THESAURUS

Concave

arched, arciform, arclike, arcual, bandy, boat-shaped, boatlike, bowed, bowl-shaped, bowlike, bowllike, cavelike, cavernous, concaved, convex, craterlike, cup-shaped, cupped, cymbiform, dish-shaped, dished, dishing, dishlike, embowed, funnel-breasted, funnel-chested, funnel-shaped, gibbose, gibbous, hollow, hollowed, humpbacked, humped, humpy, hunched, hunchy, incurved, incurving, incurvous, infundibular, infundibuliform, navicular, naviform, oxbow, retiring, retreating, saucer-shaped, scaphoid, scyphate, spoonlike, sunk, sunken, vaulted

ROGET THESAURUS

Concave

Concavity

N concavity, depression, dip, hollow, hollowness, indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus, lacuna, excavation, strip mine, trough, honeycomb, cup, basin, crater, punch bowl, cell, socket, valley, vale, dale, dell, dingle, combe, bottom, slade, strath, glade, grove, glen, cave, cavern, cove, grot, grotto, alcove, cul-de- sac, gully, arch, bay, excavator, sapper, miner, honeycomb (sponge), depressed, alveolate, calathiform, cup-shaped, dishing, favaginous, faveolate, favose, scyphiform, scyphose, concave, hollow, stove in, retiring, retreating, cavernous, porous, infundibul, infundibular, infundibuliform, funnel shaped, bell shaped, campaniform, capsular, vaulted, arched.