WOOLLY a.
ence resembling wool. Woolly bear (Zoöl.), the hairy larva of several species of bombycid moths. The most common species in the United States are the salt-marsh caterpillar (see under Salt), the black and red woolly bear, or larva of the Isabella moth (see Illust., under Isabella Moth), and the yellow woolly bear, or l…
ZYMOGEN n.
A mother substance, or antecedent, of an enzyme or chemical ferment; -- applied to such substances as, not being themselves actual ferments, may by internal changes give rise to a ferment. The pancreas contains but little ready-made ferment, though there is present in it a body, zymogen, which gives birth to the fermen…