Trigamy

• (n.) The act of marrying, or the state of being married, three times; also, the offense of having three husbands or three wives at the same time.
Found on http://thinkexist.com/dictionary/meaning/trigamy/

trigamy

state of being married to three spouses
Found on http://phrontistery.info/t.html

trigamy

trigamy A reference to someone who has three spouses simultaneously.
Found on http://www.wordinfo.info/words/index/info/view_unit/2740/5
No exact match found