plumage or mode of feathering; plumage
• (n.) Same as Pterylosis.
Pti·lo'sis noun [ New Latin , from Gr ... a feather.] (Zoology) Same as Pterylosis . 
ptilosis 1. A disease of the eyelids in which their edges become swollen and inflamed and the eyelashes fall off. 2. Pterylosis (arrangement of pterylae [bird's feather tracts or skin areas on which feathers grow] and apteria [naked or down-covered surfaces between pterylae] in birds). 3. Etymology: Greek ptilosis (from ptil(on), 'feather, plumag...