Etymology
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plastic (adj.)

1630s, "capable of shaping or molding a mass of matter," from Latin plasticus, from Greek plastikos "fit for molding, capable of being molded into various forms; pertaining to molding," also in reference to the arts, from plastos "molded, formed," verbal adjective from plassein "to mold" (see plasma). Related: Plastically.

Hence "capable of change or of receiving a new direction" (1791). The surgical sense of "remedying a deficiency of structure" is recorded by 1839 (in plastic surgery). Meaning "made of plastic" is from 1909; this was picked up in counterculture slang and given an extended meaning "false, superficial" (1963). Plastic explosive (n.) "explosive material with a putty-like consistency" is attested from 1894.

plastic (n.)

1905, "solid substance that can be molded," originally of dental molds, from plastic (adj.). The main current meaning, "synthetic product made from oil derivatives," is recorded by 1909, used in this sense by Leo Baekeland (see Bakelite).

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Definitions of plastic
1
plastic (adj.)
capable of being molded or modeled (especially of earth or clay or other soft material);
plastic substances such as wax or clay
Synonyms: fictile / moldable
plastic (adj.)
capable of being influenced or formed;
the plastic minds of children
Synonyms: pliant
plastic (adj.)
forming or capable of forming or molding or fashioning;
the plastic forces of nature
Synonyms: formative / shaping
2
plastic (n.)
generic name for certain synthetic or semisynthetic materials that can be molded or extruded into objects or films or filaments or used for making e.g. coatings and adhesives;
plastic (n.)
a card (usually plastic) that assures a seller that the person using it has a satisfactory credit rating and that the issuer will see to it that the seller receives payment for the merchandise delivered;
do you take plastic?
Synonyms: credit card / charge card / charge plate
From wordnet.princeton.edu