trinogomous
adj.— «The film explores the relationship of Sam Cagnina, the oldest son of a Mafia hit man, with his life partner, Dr. Steven Margolin, a chiropractor, and their shared wife Samantha Singh, a struggling actress from Toronto. It is a riveting story that captures the “trinogomous” union in such intimate moments as the birth of their children.» —“Exploring family” by Ana Veciana-Suarez Miami Herald (Florida) Jan. 7, 2006. (source: Double-Tongued Dictionary)