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.
Medical Definition of SERRATUS. : any of three muscles of the thorax that have complex origins but arise chiefly from the ribs or vertebrae: a: serratus anterior b: serratus posterior inferior c: serratus posterior superior.5 ENTRIES FOUND:1  serratus (noun). 2  serratus anterior (noun). 3  serratus magnus (noun).edical Definition of SERRATUS. : any of three muscles of the thorax that have complex origins but arise chiefly from the ribs or vertebrae: a: serratus anterior b: serratus posterior inferior c: serratus posterior superior. 5 ENTRIES FOUND: 1  serratus (noun).