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prepolymer

noun
pre·​polymer | \ ¦prē+\

Definition of prepolymer 

: a stable usually partially polymerized chemical intermediate that can be fully polymerized at a later time — compare monomer

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First Known Use of prepolymer

1948, in the meaning defined above

History and Etymology for prepolymer

pre- + polymer

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The first known use of prepolymer was in 1948

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