Definify.com
Webster 1913 Edition
Pyin
Py′in
,Noun.
 [Gr. [GREEK] pus.] 
(Physiol. Chem.) 
An albuminoid constituent of pus, related to mucin, possibly a mixture of substances rather than a single body. 
Definition 2025
pyin
pyin
English
Noun
pyin (uncountable)
- (biochemistry, dated) An albuminoid constituent of pus, related to mucin, possibly a mixture of substances rather than a single body.