recti 's

rec·tus   (rěk'təs)    n.   pl. rec·ti (-tī') Any of various straight muscles, as of the abdomen, eye, neck, and thigh. [New Latin (mūsculus) rēctus, from Latin, straight (muscle); see rectum.]

Main Entry: rec·tus
Pronunciation: 'rek-t&s
Function: noun
Inflected Form: plural rec·ti /-"tI/
1 : any of several straight muscles (as the rectus abdominis or the rectus femoris)
2 : any of four muscles of the eyeball that arise from the border of the optic foramen and runforward to insert into the sclera of the eyeball: a : one that is the thinnest and narrowest and inserts into the superior aspect of the sclera called also rectus superior,superior rectus b : one that is the longest, arises by two heads, and inserts into the lateral aspect of the sclera called also lateral rectus, rectus lateralis c : one that is the broadest and inserts into the medial aspect of the sclera called also medial rectus, rectus medialis d : one that inserts into theinferior aspect of the sclera called also inferior rectus, rectus inferior