pertaining to any of a set of flight feathers situated on the basal segment of a bird's wing.
a tertial feather.
Origin of tertial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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Tertial, ter′shal, adj. of the third rank among the flight-feathers of a bird's wing.
Word Origin for tertial
C19: from Latin tertius third, from ter thrice, from trēs three
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