n. [ L., one who stretches. See Extend. ] (Anat.) A muscle which serves to extend or straighten any part of the body, as an arm or a finger; -- opposed to flexor. [ 1913 Webster ]
n. [ NL. See Tension. ] 1. (Anat.) A muscle that stretches a part, or renders it tense. [ 1913 Webster ]
2. (Geom.) The ratio of one vector to another in length, no regard being had to the direction of the two vectors; -- so called because considered as a stretching factor in changing one vector into another. See Versor. [ 1913 Webster ]