chief constituent

Ebola attacks connective tissue with particular ferocity; it multiplies in collagen, the chief constituent protein of the tissue that holds the organs together.

Fan deposits are the chief constituent of the Muddy Creek.

A fragrant substance which is the chief constituent of ambergris.

The fact was demonstrated, beyond the chance of doubt or question, that carbonic oxide is the chief constituent of cigarette smoke, if not all tobacco smoke, and that its inhalation into the air-passage and lungs must of necessity be exceedingly deleterious, as much so to men and boys as to mice.

These salts also are an important, if not the chief, constituent of biliary and urinary calculi.