reg/rect

rule; direct; make straight

Spelled reg, rect · regere 'rule, direct, straighten'; rectus 'straight, right'; rex, regis 'king'

Latin regere directs a line or a life: regular follows a rule, correct sets things straight, and rectitude keeps conduct upright.

Words built from it

rectitude — Honesty and morally upright conduct.
rect (right) + -itude (state or quality)
regime — A system of government or management.
reg (rule)
regal — Royal or grand like a king or queen.
reg (king) + -al (relating to)
regular — Following a rule, pattern, or usual schedule.
reg (rule) + -ular (relating to)
correct — Free from error; also, to put something right.
cor- (thoroughly; form of com-) + rect (make straight)
direct — Straight or immediate; also, to guide.
di- (apart; form of dis-) + rect (make straight)
erect — Upright; also, to build or raise.
e- (up; form of ex-) + rect (make straight)

regard — From Old French regarder: re- plus garder, meaning watch or guard. Garder has Germanic origins, rather than Latin regere.