A quad is an abbreviation for "quadruple" or four, but when refering to people, or polyamours lovers, "Fourple" could also be used to indicate four people who are equally in love with each other.
1. Co-anchor Dan Harris of ABC News recently did a story on Polyamory and said, "More couples opting to become triples or fourples. Live-in lovers spicing up the marital bed, even helping raise the children."
2. Showtime's hit docu-series, "Polyamory: Married & Dating" followed a triad in Los Angeles and a Fourple in san diego.
3. The fourple went everywhere and did everything together.