polymethylene

noun
poly·​meth·​y·​lene | \ ˌpäl-i-ˈmeth-ə-ˌlēn, -lən How to pronounce polymethylene (audio) \

Medical Definition of polymethylene

1 : a hydrocarbon constituted of methylene groups
2 : a bivalent radical −(CH2)n− consisting of a series of methylene groups

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