quintilateral
adjectiveUK /ˌkwɪntɪˈlætərəl/
US /ˌkwɪntɪˈlætərəl/
A quintilateral shape is a flat shape with five straight sides.
The kite we made was quintilateral, with five straight edges.
OTHER MEANINGS
2. Having five sides or five participating parties.
The quintilateral agreement was signed by five neighboring towns.
3. A figure or object that has five sides.
She drew a quintilateral on the chalkboard and labeled each corner.
4. Involving five distinct groups or elements arranged together.
The quintilateral meeting brought together five different clubs.