a combining form with the meanings âheight,â âtip end,â âextremities of the body,â used in the formation of compound words: acrophobia. Also, especially before a vowel, acr-. Origin of acro-. < Greek, combining form of Ã¡kros topmost, highest; akin to Latin Äcer sharp.
â¢ CANTUS FIRMUS (noun) The noun CANTUS FIRMUS has 1 sense: 1. a melody used as the basis for a polyphonic composition. Familiarity information: CANTUS FIRMUS used as a noun is very rare. Dictionary entry details.
ectropion. Outward turning of the eyelid margin. The most common cause is a loss of tonus of the pretarsal orbicularis muscle combined with laxity of the medial and lateral canthal tendons, which occurs in old people and affects only the lower eyelid (involutional ectropion).