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

(anatomy) A fusiform muscle, one of the four quadriceps muscles, situated in the middle of the front of the thigh.

(anatomy) The broadest of the four extraocular muscles of the eyeball in the orbit, which arises from the border of the optic foramen and inserts into the medial aspect of the sclera.

(anatomy) The longest of the four extraocular muscles of the eyeball in the orbit, which arises by two heads from the border of the optic foramen and inserts into the lateral aspect of the sclera.

(anatomy) The thinnest and narrowest of the four extraocular muscles of the eyeball in the orbit, which arises from the border of the optic foramen and inserts into the superior aspect of the sclera.

(anatomy) One of the four extraocular muscles of the eyeball in the orbit, which arises from the border of the optic foramen and inserts into the inferior aspect of the sclera.

(anatomy) A paired muscle running vertically on each side of the anterior wall of the abdomen in humans and some other mammals.

A rectus, any of several straight muscles in the body.

(neuroanatomy) a gyrus in the frontal lobe of the brain, adjacent to the longitudinal fissure

(grammar, dated) The nominative case, sometimes grouped with the vocative case, as a single morphological case contrasted with the oblique case.