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Definition: Sigmodontes
Sigmodont
\Sig"mo*dont\, n. [Gr. ??? sigma (?) + ???, ???, a
tooth.] (Zo["o]l.)
Any one of a tribe (
Sigmodontes) of rodents which includes
all the indigenous rats and mice of America. So called from
the form of the ridges of enamel on the crowns of the worn
molars. Also used adjectively.
[1913 Webster]