I. noun — [ mass noun] 1. a skin condition characterized by red pimples on the skin, especially on the face, due to inflamed or infected sebaceous glands and prevalent chiefly among adolescents. • he was clean-shaven with a face that had been ravaged by acne when younger.
II. derivatives acned adjective
– origin mid 19th cent.: via modern Latin from Greek aknas, a misreading of akmas, accusative plural of akmē ‘highest point, peak, or facial eruption’; compare with acme.