pterylosis

noun
pter·​y·​lo·​sis | \ ˌterəˈlōsə̇s\
plural pteryloses\ -​ōˌsēz \

Definition of pterylosis

: the arrangement of feathers in definite areas of growth birds … at least three years old judging from the pterylosis of the headAmerican Midland Naturalist

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History and Etymology for pterylosis

New Latin, from pteryla + -osis

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