Alternative definition : NCI-GLOSS: A thick substance that comes from plants or can be made in the laboratory
from certain chemicals. Resins do not dissolve in water, and are used in plastics,
varnishes, printing inks, medicine, and to make fabrics stiff.; FDA: Any of various solid or semisolid, amorphous, fusible, flammable, natural organic
plant secretions that are usually transparent or translucent. It is typically colored
yellowish to brown and is soluble in organic solvents (as ether) but not in water.;