noun
: the theory that chemical compounds are derived by substitution from a limited number of type compounds (as hydrogen, water, ammonia, and methane) and that developed into the modern unitary theory
noun
: the theory that chemical compounds are derived by substitution from a limited number of type compounds (as hydrogen, water, ammonia, and methane) and that developed into the modern unitary theory
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012