(chemistry, in combination) Any of various polymers whose respective monomer is a methyl derivative; Any of various compounds having many methyl groups

(organic chemistry) methylated with many methyl groups

(organic chemistry) A thermoplastic transparent plastic manufactured by the polymerization of methyl methacrylate, often used in place of glass - it being lighter, softer and not shattering on impact.

(chemistry) A polymer of methyl acrylate, used as a resin in lacquers etc

(chemistry) A tough, transparent thermoplastic polymer of methyl methyacrylate; it is used as a substitute for glass under the proprietary names of Perspex, Plexiglass and Lucite

(chemistry) polymethyl methyacrylate

(chemistry) polymethyl acrylate

(obsolete, chemistry) Any organic compound having a general formula (CH₂)ₙ / (chemistry, in combination) Any of many organic compounds either having a polymeric structure of repeating -CH₂- groups

plural of polymethylene

A thermoplastic polymer of methylpentene