Meaning of CONCAVE in English

CONCAVE

I. kän-ˈkāv, ˈkän-ˌ adjective

Etymology: Middle English, from Latin concavus, from com- + cavus hollow — more at cave

Date: 15th century

1. : hollowed or rounded inward like the inside of a bowl

2. : arched in : curving in — used of the side of a curve or surface on which neighboring normals to the curve or surface converge and on which lies the chord joining two neighboring points of the curve or surface

II. ˈkän-ˌkāv noun

Date: 1552

: a concave line or surface

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.