any of various straight muscles, as of the eye, neck, or thigh
Origin of rectusModern Latin ; from Classical Latin rectus (musculus), literally , straight (muscle): see recti-
Any of various straight muscles, as of the abdomen, eye, neck, and thigh.
Origin of rectusNew Latin (mūsculus) rēctus, from Latin, straight (muscle); see rectum.
From the Latin phrase "(musculus) rectus", or "a straight (muscle)".
Rectus therefore means straight in Latin.