Pteryla :: Pteryla (n.) One of the definite areas of the skin of a bird on which feathers grow; -- contrasted with apteria.

Pterylae :: Pterylae (pl. ) of Pteryl.

Pterylography :: Pterylography (n.) The study or description of the arrangement of feathers, or of the pterylae, of birds..

Pterylosis :: Pterylosis (n.) The arrangement of feathers in definite areas.

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