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.
Trending Now. Answers. Best Answer: In music, a cantus firmus (fixed song) is a pre-existing melody forming the basis of a polyphonic composition, often set apart by being played in long notes. Composition using a cantus firmus was a common technique in Medieval music, forming the basis of organum as well as 13th- and 14th-century motets.