\Pit`y*ri"a*sis\, n. (Veter.)
A disease of domestic animals characterized by dry epithelial
scales, and due to digestive disturbances and alteration of
the function of the sebaceous glands.

\Pit`y*ri"a*sis\, n. [NL., fr. Gr. ?, fr. ?, lit.,
bran.] (Med.)
A superficial affection of the skin, characterized by
irregular patches of thin scales which are shed in branlike
particles.
{Pityriasis versicolor} [NL.] (Med.), a parasitic disease of
   the skin, characterized by the development of reddish or
   brownish patches.