rectus
UK[ˈrɛktəs]US[ˈrɛktəs]
n
Any of several straight muscles, especially of the abdomen or eye.
Morpheme Breakdown
rect
us
rect
straight
us
masculine suffix
Etymology
The word 'rectus' is a direct borrowing from Latin, where it functioned as an adjective meaning 'straight, upright, correct'. It originates from the past participle of the verb 'regere', meaning 'to lead straight, to rule'. This verb is traced back to the Proto-Indo-European root h₃reǵ-, which carries the core sense of 'to move in a straight line', extending to concepts of directing and ruling. In modern anatomical terminology, the Latin adjective was nominalized to specifically denote muscles that typically run in a straight, parallel orientation relative to the body's midline, such as the rectus abdominis or the rectus femoris.
Analysis
Structure: rect (straight) + us (masculine suffix)
'rect' is from Latin 'rectus', meaning 'straight, correct'. 'us' is a Latin masculine noun suffix.
Examples
The rectus abdominis is a key muscle for core stability.
Paralysis of an extraocular rectus muscle can cause double vision.
The surgeon carefully dissected the tissue to expose the rectus sheath.