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

Plastic
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1. \-plas"tic\ (-pl[a^]s"t[i^]k). [Gr. ? fit for molding,
   plastic, fr. ? to mold, to form.]
   A combining form signifying developing, forming, growing; as,
   heteroplastic, monoplastic, polyplastic.
   

2. \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.
   {Plastic clay} (Geol.), one of the beds of the Eocene period;
      -- so called because used in making pottery. --Lyell.
   {Plastic element} (Physiol.), one that bears within the germs
      of a higher form.
   {Plastic exudation} (Med.), an exudation thrown out upon a
      wounded surface and constituting the material of repair by
      which the process of healing is effected.
   {Plastic foods}. (Physiol.) See the second Note under {Food}.
   {Plastic force}. (Physiol.) See under {Force}.
   {Plastic operation}, an operation in plastic surgery.
   {Plastic surgery}, that branch of surgery which is concerned
      with the repair or restoration of lost, injured, or
      deformed parts of the body.