Etymology
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elastic (adj.)

1650s, formerly also elastick, coined in French (1650s) as a scientific term to describe gases, "having the property of recovering its former volume after compression," from Modern Latin elasticus, from Greek elastos "ductile, flexible," related to elaunein "to strike, beat out," which is of uncertain origin; according to Watkins from an extended form of the PIE base *ele- "to go."

Applied to solids from 1670s, "having the power of returning to the form from which it is bent, etc., as soon as the applied force is removed." Figurative use by 1859. The noun meaning "piece of elastic material," originally a cord or string woven with rubber, is from 1847, American English.

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elasticity (n.)

"the property of being elastic," 1660s, from French élasticité, or else from elastic + -ity.

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elasmosaurus (n.)

giant sea reptile from the Mesozoic, 1868, from Modern Latin (coined by E.D. Cope), from Greek elasmos "metal plate" (from elan "to strike;" see elastic) + -saurus. So called from the caudal laminae and the great plate-bones.

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inelastic (adj.)
1748, "not rebounding after a strain," from in- (1) "not, opposite of" + elastic (adj.). Figurative sense "rigid, unyielding" attested by 1867. Related: Inelasticity.
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elasmobranch (n.)

1859, from Elasmobranchii, class of fishes that includes sharks and rays, from combining form of Greek elasmos "metal plate," from elan "to strike" (see elastic) + brankhia "gill." So called from their plate-like gills.

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Lycra 
elastic polyurethane fiber, 1955, proprietary name (registered by E.I. DuPont de Nemours and Company, Wilmington, Delaware, U.S.) of an elastic polyurethane fiber.
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stockinet (n.)
elastic, machine-made fabric used for undergarments, 1824, from stocking + diminutive ending -et.
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springy (adj.)
"elastic," 1650s, from spring (v.) + -y (2). Related: Springiness.
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springboard (n.)

also spring-board, "elastic board used in vaulting, etc.," 1774, from spring (v.) + board (n.1).

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spongy (adj.)
"soft, elastic," 1530s, from sponge (n.) + -y (2). Of hard material (especially bone) "open, porous," 1590s. Related: Sponginess.
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