UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪˈlæstəmə/US:USA pronunciation: respellingUSA pronunciation: respelling(i lastə mər)

WordReference Random House Unabridged Dictionary of American English © 2020
e•las•to•mer  (i lastə mər),USA pronunciation n. [Chem.]
  1. Chemistryan elastic substance occurring naturally, as natural rubber, or produced synthetically, as butyl rubber or neoprene.
e•las•to•mer•ic  (i lastə mər),USA pronunciation adj. 
  • 1935–40; elast(ic) + -o- + Greek méros a part

Collins Concise English Dictionary © HarperCollins Publishers::
elastomer /ɪˈlæstəmə/ n
  1. any material, such as natural or synthetic rubber, that is able to resume its original shape when a deforming force is removed
Etymology: 20th Century: from elastic + -mer

elastomeric /ɪˌlæstəˈmɛrɪk/ adj
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