(of an alcohol) containing three hydroxyl groups.
- ‘Fats are triesters that consist of the trihydric alcohol glycerol that is esterified with three fatty acids.’
- ‘Glycerol is a trihydric alcohol because it contains three hydroxyl or alcohol groups.’
- ‘Glycerol is a trihydric alcohol, which means each molecule has three hydroxyl groups.’
- ‘The trihydric alcohol structure of glycerin makes it a useful chemical in the manufacture of various hard foams, like those that are placed under siding in buildings and around dishwashers and refrigerators for insulation and sound proofing.’
- ‘Alcohols have one, two, or three hydroxyl groups attached to their molecules and are thus classified as monohydric, dihydric, or trihydric, respectively.’
Mid 19th century: from tri- ‘three’+ hydrogen + -ic.
We take a look at several popular, though confusing, punctuation marks.