Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or designating the third row of flight feathers on the basal section of a bird's wing.
  • n. A tertial feather.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any flight feather attached to the humerus (upper arm) of a bird.

from the GNU version of the Collaborative International Dictionary of English

  • Same as tertiary.

from The Century Dictionary and Cyclopedia

  • Of the third rank or row among the flight-feathers of a bird's wing; tertiary, as a quill-feather.
  • n. A tertiary flight-feather; one of the penn├Ž, or large feathers, of a bird's wing of the third set, which grow on the elbow or upper arm; one of the tertiaries.

Etymologies

Latin tertius, third; see tertiary + -al1.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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