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.
Chambers's Twentieth Century Dictionary
- n Ptilosis tī-lō′sis plumage or mode of feathering of a bird
- Ptilosis Also Pterylō′sis