/di sem"beuhr/ , n.
the twelfth month of the year, containing 31 days. Abbr.: Dec.
[ bef. 1000; ME decembre december (s. decembr- ) the tenth month of the early Roman year, appar. dec ( em ) -membri-, equiv. to decem TEN + * -membri- mens- month + -ri- suffix (with -sr- > -br- and assimilation of nasal) ]