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.
Also termed tonus; the normal state of balanced tension in the tissues of the body, especially the muscles. Mentioned in: Contractures. syn tonus (1) in skeletal muscle, a state of tension that is maintained continuously-minimally even when relaxed-and which increases in resistance to passive stretch.