tertial

[tur-shuhl] Ornithology.
adjective
1.
pertaining to any of a set of flight feathers situated on the basal segment of a bird's wing.
noun
2.
a tertial feather.

Origin:
1830–40; < Latin terti(us) third + -al1

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World English Dictionary
tertial (ˈtɜːʃəl)
 
adj, —n
tertiary another word for tertiary
 
[C19: from Latin tertius third, from ter thrice, from trēs three]

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Example sentences
Tertial coverts have broad edging which is pale brown.
Immature tertial coverts are narrow and yellow-green.
Tertial: the innermost flight flight feathers of the wing, attached to the humerus bone in the bird's upper arm.
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