Having the nature of or resembling a copolymer; composed of multiple different monomer units joined together.
From copolymer plus -ous (adjective-forming suffix meaning 'full of'). This adjectival form appeared in chemistry texts as the field developed more precise terminology.
While 'copolymeric' focuses on the chemistry, 'copolymerous' emphasizes the physical character—it's the difference between saying 'made of copolymer' versus 'having copolymer-like properties throughout.'
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