What's the adjective for polymethylenes? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs polymerize and polymerise which may be used as adjectives within certain contexts.
“The proximal aulacophore is polymerous, rather than tetramerous and superficially similar to that of the earliest stylophoran, Ceratocystis.”
“The complex polymerous flowers of water lilies with no clear differentiation between sepals and carpels fit very well into the euanthian school of flower origin theories.”