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.
â¢ The palpebral fssure of the ellipitcal open space between the eyelids. â¢ The lower lid margin is just at the limbus , the border between the cornea and sclera. â¢ The canthus is the corner of the eye , the angle where the lids meet. â¢ At the inner canthus the caruncle is a small Feshy mass containing sebaceous glands.