Originally: designating polymeric compounds prepared from derivatives of ethylene (cf. polyethylene, n. 1). Now: of, relating to, or of the nature…

Chemistry. Designating compounds which are polymers of acrylic acid, its esters, or its substituted derivatives. Also: designating thermoplastic…

The proprietary name for polyethylene terephthalate used as a textile fibre. Cf. Terylene, n.

Designating thermoplastics characterized by a linear molecule containing recurring phenoxy groups, typically made by condensation of epoxides (esp…