A Rectus

(anatomy) Any of several straight muscles in various parts of the body, as of the abdomen, thigh, eye etc.Hyponyms: rectus abdominis, rectus capitis anterior, rectus capitis lateralis, rectus capitis posterior major, rectus capitis posterior minor, rectus femoris

1. (anatomy) Ellipsis of rectus abdominis.
2. (anatomy) Any of a number of muscles controlling the movement of the eyeball.