bigamist

from WordNet (r) 3.0 (2006)
bigamist
    n 1: someone who marries one person while already legally
         married to another
from The Collaborative International Dictionary of English v.0.48
Bigamist \Big"a*mist\, n. [Cf. {Digamist}.]
   One who is guilty of bigamy. --Ayliffe.
   [1913 Webster]
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