pterylosis

noun pter·y·lo·sis \ˌterəˈlōsə̇s\

Definition of pterylosis

plural

pteryloses

\-ōˌsēz\
  1. :  the arrangement of feathers in definite areas of growth birds … at least three years old judging from the pterylosis of the head — American Midland Naturalist

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Origin and Etymology of pterylosis

New Latin, from pteryla + -osis


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