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একই যৌগের বা বিভিন্ন যৌগের বহুসংখ্যক অণু রাসায়নিকভাবে জুড়ে গিয়ে শৃঙ্খলাকৃত উচ্চ আণবিক গুরুত্ব বিশিষ্ট যে-যৌগ তৈরি করে, তাকে পলিমার বলে।
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একই যৌগের বা বিভিন্ন যৌগের বহুসংখ্যক অণু রাসায়নিকভাবে জুড়ে গিয়ে শৃঙ্খলাকৃত উচ্চ আণবিক গুরুত্ব বিশিষ্ট যে-যৌগ তৈরি করে, তাকে পলিমার বলে।