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rigor
late 14c., from O.Fr.
rigor
(13c.), from L.
rigorem
(nom.
rigor
) "numbness, stiffness, rigor," from
rigere
"be stiff" (see
rigid
).
Rigor mortis
is 1839, from L.
rigor
"stiffness" +
mortis,
gen. of
mors
"death" (see
mortal
).
