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From  Polymer Noun Formed Consisting Synthetic Poly·Mer  International

Title polymer
Text
Merriam-Webster's Collegiate Dictionary
poly·mer
 \\ˈpä-lə-mər\\ noun
 ETYMOLOGY  International Scientific Vocabulary, back-formation from polymeric, from Greek polymerēs having many parts, from poly- + meros part — more at 
merit
 DATE  1866
: a chemical compound or mixture of compounds formed by polymerization and consisting essentially of repeating structural units
• poly·mer·ic 
 \\ˌpä-lə-ˈmer-ik\\ adjective
• poly·mer·ism 
 
 \\pə-ˈli-mə-ˌri-zəm, ˈpä-lə-mə-\\ noun
English Etymology
polymer
  1866, probably from Ger. Polymere (Berzelius, 1830), from Gk.polymeres "having many parts," from polys "many" (see poly-) + meros "part."
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
polymer
poly·mer 5pClimE(r)NAmE 5pB:l- / noun   (chemistry 化) a natural or artificial substance consisting of large 
molecules
 (= groups of atoms) that are made from combinations of small simple 
molecules
 
   聚合物;聚合体
Webster's Third New International Dictionary, Unabridged
poly·mer
\ˈpälə̇mə(r), -lēm-\ noun
(-s)
Etymology: International Scientific Vocabulary, back-formation from polymeric; probably originally formed in German
: a natural or synthetic chemical compound or mixture of compounds formed by polymerization and consisting essentially of repeating structural units; especially : high polymer — compare 
copolymer
dimer
homopolymer
isomer
monomer
macromolecule
plastic
resin
 2a, synthetic fibersynthetic rubber

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