The Collaborative International Dictionary of English v.0.48:

Acrylic resin \A*cryl"ic re"sin\, n.
   1. (Chem.) a thermoplastic made by polymerization of acrylic
      acid or methacrylic acid or some derivative of these (such
      as the esters or amides). It can be formed into a clear
      hard plastic, and is the basis for the commercial plastics
      called Lucite and Plexiglass.
      [PJC]

WordNet (r) 3.0 (2006):

acrylic resin
    n 1: a glassy thermoplastic; can be cast and molded or used in
         coatings and adhesives [syn: acrylic, acrylic resin,
         acrylate resin]