tertiary
Pronunciation:
/ˈtɜː.ʃi.ə.ɹiː//ˈtɝ.ʃi.æ.ɹi/noun
Definitions
Any item considered to be of third order.
A tertiary colour.
Something from the Tertiary Period (the former term for the geologic period from 65 million to 2.58 million years ago).
A tertiary feather; a tertial.
adjective
Definitions
Of third rank or order; subsequent.
Possessing some quality in the third degree; especially having been subjected to the substitution of three atoms or radicals.
Example: a tertiary alcohol, amine, or salt
Of quills: growing on the innermost joint of a bird's wing; tertial.