tertialadj.n.
/ˈtəːʃəl/ Ornithology.
A. adj.
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Of or pertaining to the third rank or row of quill- or flight-feathers in the wing of a bird.
B. n.
A flight-feather of the third row; sometimes also applied to secondaries on the elbow-joint. See tertiary n. 3.
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tertiary1834
tertial1836
1836 W. Swainson On Nat. Hist. & Classif. Birds I. i. iii. 81 They [sc. Quills]..form three divisions, distinguished as the primaries, the secondaries, and the tertials... The tertials..have their origin from the humerus.
1842 W. T. Brande Dict. Sci., Lit. & Art 1224/2 Tertials, Tertiariae.
1874 E. Coues Birds Northwest 665 The color of the mantle extends..to the tips of the tertials.
This entry has not yet been fully updated (first published 1911; most recently modified version published online December 2021).
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adj.n.1836