Webster’s Revised Unabridged Dictionary · 1913
Polymerize
Pol′y·mer·ize (pŏl′ĭ·mĕr·īz), v. t. (Chem.) To cause polymerization of; to produce polymers from; to increase the molecular weight of, without changing the atomic proportions; thus, certain acids polymerize aldehyde.
Pol′y·mer·ize, v. i. (Chem.) To change into another substance having the same atomic proportions, but a higher molecular weight; to undergo polymerization; thus, aldehyde polymerizes in forming paraldehyde.