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polyisobutylene

[ pol-ee-ahy-suh-byoot-l-een ]
/ ˌpɒl iˌaɪ səˈbyut lˌin /
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noun Chemistry.
a polymer of isobutylene, used chiefly in the manufacture of synthetic rubber.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Also pol·y·i·so·bu·tene [pol-ee-ahy-suh-byoo-teen]. /ˌpɒl iˌaɪ səˈbyu tin/.

Origin of polyisobutylene

First recorded in 1930–35; poly- + isobutylene
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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