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Meaning of tertial

ter•tial

Pronunciation: (tûr'shul), [key]
— Ornith. Ornith.
—adj.
  1. pertaining to any of a set of flight feathers situated on the basal segment of a bird's wing.
—n.
  1. a tertial feather.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.