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.
The lumbar plexus is what separates the superficial part from the deep part. The psoas major assists with the flexion and external rotation of the hip joint. It is also considered part of the group of muscles that are known as the hip flexors. If this muscle tightens, the action may result in lower back pain.