(archaic) Harsh and sharp, or bitter and not pleasant to the taste; acrid, pungent.

A sharp and bitter hatred.

(organic chemistry) Any of many thermoplastic or thermosetting polymers or copolymers of acrylic acid, methacrylic acid, esters of these acids, or acrylonitrile; used in paint and many plastics.

(organic chemistry) Derived from acrylic acid or acrylonitrile. / Containing an acrylic resin.

(organic chemistry) An acrylic resin. / (painting) A paint containing an acrylic resin. / A painting executed using such a paint. / A thick sheet of plastic.

(organic chemistry) A colourless liquid unsaturated organic acid, CH₂=CHCOOH; used as a monomer in the production of acrylic resins; forms acrylate esters by combination with alcohols.

(idiomatic) Pertaining to all categories or things. / (gambling) Having an equal amount staked on a competitor placing first, second, or third.

The Athenian Acropolis. (Compare acropolis.)

Used other than figuratively or idiomatically: see come, across. / (figuratively) To change sides; to cross over to work for the opposition.

(transitive, intransitive) To cross; to move from one side (of something) to the other, literally or figuratively.