• Webster's Revised Unabridged Dictionary
    • n Ptilosis (Zoöl) Same as Pterylosis.
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Century Dictionary and Cyclopedia
    • n ptilosis In ornithology, plumage; the feathering of a bird, considered with reference to the texture or other character of the feathers themselves. Compare pterylosis.
    • n ptilosis In medicine, loss of the eyelashes.
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Chambers's Twentieth Century Dictionary
    • n Ptilosis tī-lō′sis plumage or mode of feathering of a bird
    • Ptilosis Also Pterylō′sis
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Webster's Revised Unabridged Dictionary
NL., fr. Gr a feather