bisphenol A

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A white solid, C₁₅H₁₆O₂, having a mild phenolic odor, used as a monomer for polycarbonate and epoxy resins, and in other plastics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry The diphenol 4,4'-dihydroxy-2,2-diphenylpropane used in the manufacture of polymers