Triouple 

Triouple (try-up-el), noun: a term used to define a romantically platonic relationship among three people.

Hannah, Jesse, and Chelsey make an adorable triouple.

Triouple by LittleDemon February 20, 2015

Trouple

It is a combination of "couple" and "triple" where the three individuals are in an equally inclusive relationship.

Tim, Pat and Lawrence all live together and share a california king while they enjoy being a "trouple."

Trouple by April from vancouverl January 3, 2011

trouple

A three-way couple in a long term relationship

Mike, Rick and Steve have been together for six years. They're a trouple.

trouple by chris January 16, 2004

Trouple

A couple who has a friend that is always with them becomes a trouple. The third person has to be friends enough or have been hanging out with the couple long enough to not feel like a third wheel, thus becoming a trouple.

It was decided that Gary was part of a trouple when he went with Frank and Tracy to Las Vegas.

Trouple by Tracy076 May 4, 2008

Trouple

When one person is openly dating someone that's openly dating someone else but they're not all dating each other equally.

We're a trouple- that's my boyfriend's boyfriend, Joey.

Trouple by CharityAprilL August 6, 2015

Trioplegic

Being paralyzed with three-limbs.

Only if christopher reeves was a trioplegic, maybe he would still be alive.

Trioplegic by Sloner0407 July 23, 2009

Tricouple 

Three people who are either married or having a sexual relationship together

The tricouple will be travelling for the first time together next week

Tricouple by Glo4st July 2, 2018