m (S) The whole arm (from the shoulder to the tips of the fingers). 2 An arm or a side of a polygon or geometrical figure gen. 3 The base of a right-angled triangle. 4 The supplement of two or four right angles, or the complement of three right angles. 5 The sine of the arc of a circle passing through the poles of the prime vertical, which arc is intercepted between a heavenly body and the prime vertical. 6 A bending or curve.