TERTIAL

Noun

tertial (plural tertials)

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

Source: Wiktionary

Ter"tial, a. & n. Etym: [From L. tertius third, the tertial feathers being feathers of the third row. See Tierce.] (Zoöl.)

Definition: Same as Tertiary.

Source: Webster’s Unabridged Dictionary 1913 Edition

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