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.
firm 1. (fÃ»rm) adj. firmÂ·er, firmÂ·est. 1. Resistant to externally applied pressure. 2. Marked by or indicating the tone and resiliency of healthy tissue: firm muscles. 3. Securely fixed in place: Despite being hit by the car, the post was still firm. 4. Indicating or possessed of determination or resolution: a firm voice.