A ply is a layer. Plywood is made by slicing trees into layers and gluing the layers together. Toilet paper is usually two-ply, meaning two layers of paper. Plies is the plural of ply.
pli·é plēˈā/Submit BALLET noun plural noun: pliés 1. a movement in which a dancer bends the knees and straightens them again, usually with the feet turned out and heels firmly on the ground. verb 3rd person present: pliés 1. perform a plié.
