📖 Definitions of "Tertiary"
noun
- 1
Any item considered to be of third order.
- 2
A tertiary colour.
- 3
Something from the Tertiary Period (the former term for the geologic period from 65 million to 2.58 million years ago).
- 4
A tertiary feather; a tertial.
adjective
- 1
Of third rank or order; subsequent.
- 2
Possessing some quality in the third degree; especially having been subjected to the substitution of three atoms or radicals.
"a tertiary alcohol, amine, or salt"
- 3
Of quills: growing on the innermost joint of a bird's wing; tertial.
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