the GNU version of the Collaborative International Dictionary of English
n. One who is guilty of bigamy.
The Century Dictionary and Cyclopedia
n. One who has committed bigamy, or had two or more wives or husbands at once.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who marries one person while already legally married to another
Word Usage
"But incidentally parallel with this most delightful fact runs the observation that the house of the bigamist is a house divided against itself and the fruitful source of much mischief and the effectual disruption of all true discipline."