rectus
Pronunciation: /ˈrɛktəs/
noun ( plural recti /-tʌɪ/)
Anatomy- any of several straight muscles, in particular:
- (also rectus abdominis /abˈdɒmɪnɪs/) each of a pair of long flat muscles at the front of the abdomen, joining the sternum to the pubis and acting to bend the whole body forwards or sideways.
- any of a number of muscles controlling the movement of the eyeball.

Origin:
early 18th century: from Latin, literally 'straight'