G0271200 (grĭm′ĭs, grĭ-mās′)n. A sharp contortion of the face expressive of pain, contempt, or disgust.intr.v.grim·aced, grim·ac·ing, grim·ac·es To make a sharp contortion of the face.[French, from Old French grimache, alteration of grimuche, probably from Frankish *grīma, mask.]grim′ac·er n.MedicalSeegrimace