Etymology
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Words related to plastic

Bakelite (n.)
type of plastic widely used early 20c., 1909, from German Bakelit, named for Belgian-born U.S. physicist Leo Baekeland (1863-1944), who invented it. Originally a proprietary name, it is formed by the condensation of a phenol with an aldehyde.
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plasma (n.)

1712, "form, shape" (a sense now obsolete), a more classical form of earlier plasm; from Late Latin plasma, from Greek plasma "something molded or created," hence "image, figure; counterfeit, forgery; formed style, affectation," from plassein "to mold," originally "to spread thin," from PIE *plath-yein, from root *pele- (2) "flat; to spread."

Sense of "the liquid part of blood, etc., as distinguished from the corpuscles" is from 1845. In physics, the sense of "ionized gas" is by 1928.

*pele- (2)
*pelə-, Proto-Indo-European root meaning "flat; to spread."

It forms all or part of: airplane; dysplasia; ectoplasm; effleurage; esplanade; explain; explanation; feldspar; field; flaneur; floor; llano; palm (n.1) "flat of the hand;" palm (n.2) "tropical tree;" palmy; piano; pianoforte; plain; plan; planar; Planaria; plane (n.1) "flat surface;" plane (n.3) "tool for smoothing surfaces;" plane (v.2) "soar, glide on motionless wings;" planet; plani-; planisphere; plano-; -plasia; plasma; plasmid; plasm; -plasm; -plast; plaster; plastic; plastid; -plasty; Polack; Poland; Pole; polka; protoplasm; veldt.

It is the hypothetical source of/evidence for its existence is provided by: Greek plassein "to mold," plasma "something molded or created;" Latin planus "flat, level, even, plain, clear;" Lithuanian plonas "thin;" Celtic *lanon "plain;" Old Church Slavonic polje "flat land, field," Russian polyi "open;" Old English feld, Middle Dutch veld "field."
Plasticine 

proprietary name of a modeling clay substitute, 1897, from plastic (adj.) + -ine (2).

plasticity (n.)

"capability of being molded or formed; property of giving form or shape to matter," 1768, from plastic (adj.) + -ity.

pleather (n.)

"artificial or synthetic leather as a material in clothing, upholstery, etc.," by 1991, from plastic + leather.

thermoplastic (adj.)
1870, see thermo- + plastic (adj.). As a noun from 1929.