n 1 a  :  any of various solid or semisolid amorphous fusible flammable natural organic substances that are usu. transparent or translucent and yellowish to brown, are formed esp. in plant secretions, are soluble in organic solvents (as ether) but not in water, and are electrical nonconductors  b  :  ROSIN  c  :  a solid pharmaceutical preparation consisting chiefly of the resinous principles of a drug or drugs usu. extracted by solvents < of jalap>   2 a  :  any of a large class of synthetic products that have some of the physical properties of natural resins but are different chemically and are used chiefly in plastics  b  :  any of various products made from a natural resin or a natural polymer .
 
 
 
Similar sounding terms:  ri·cin  ros·in 
 
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