Source : Webster's Revised Unabridged Dictionary (1913)

Plastic \Plas"tic\ (pl[a^]s"t[i^]k), a. [L. plasticus, Gr. ?,
   fr. ? to form, mold: cf. F. plastique.]
   1. Having the power to give form or fashion to a mass of
      matter; as, the plastic hand of the Creator. --Prior.

            See plastic Nature working to his end. --Pope.

   2. Capable of being molded, formed, or modeled, as clay or
      plaster; -- used also figuratively; as, the plastic mind
      of a child.

   3. Pertaining or appropriate to, or characteristic of,
      molding or modeling; produced by, or appearing as if
      produced by, molding or modeling; -- said of sculpture and
      the kindred arts, in distinction from painting and the
      graphic arts.

            Medallions . . . fraught with the plastic beauty and
            grace of the palmy days of Italian art. --J. S.
                                                  Harford.

Source : WordNet®

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
     adj 1: used of the imagination; "material...transformed by the
            plastic power of the imagination"--Coleridge
     2: capable of being molded or modeled (especially of earth or
        clay or other soft material); "plastic substances such as
        wax or clay" [syn: {fictile}, {moldable}]
     3: capable of being influenced or formed; "the plastic minds of
        children"; "a pliant nature" [syn: {pliant}]