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The Collaborative International Dictionary
Pterylography

Pterylography \Pter`y*log"ra*phy\, n. [Pteryla + -graphy.] (Zo["o]l.) The study or description of the arrangement of feathers, or of the pteryl[ae], of birds.

Wiktionary
pterylography

n. (context zoology English) The study or description of the arrangement of feathers, or of the pterylae, of birds.