Flexion

Webster's Condensed Dictionary- A Condensed Dictionary of the English Language · 1909 · p. 229

flek's hun, n. Act of flexing or bending; a part bent; fold. (Gram.) Inflection. (Anat.) The action of the flexor muscles. — Flex'or, n. (Anat.) — A muscle whose office to produce flexion. [L.]