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- noun an elastic macromolecular material that at room temperature returns rapidly to approximately its initial dimensions and shape after substantial deformation by a weak stress and release of the stress
- A term descriptive of various polymers that, after being temporarilybut substantially deformed by stress, will return to their initial size and shape immediately upon the release of the stress.
- A substance or material whose elasticity is similar to that of natural rubber. Such a substance or material may be natural or synthetic, and may be used, for instance, in flexible circuits, or as packing in the housing of scintillation counters.