late 14c., from Old French rigor "strength, hardness" (13c., Modern French rigueur), from Latin rigorem (nominative rigor) "numbness, stiffness, hardness, firmness; roughness, rudeness," from rigēre "be stiff," from PIE root *reig- "stretch; be stretched; be stiff."
the rigors of boot camp
right-minded
righty
rigid
rigidity
rigmarole
rigor
rigor mortis
rigorous
rigour
rile
rill
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