The Collaborative International Dictionary
Pyin
Pyin \Py"in\, n. [Gr. ? pus.] (Physiol. Chem.) An albuminoid constituent of pus, related to mucin, possibly a mixture of substances rather than a single body.
Wiktionary
pyin
n. (context biochemistry dated English) An albuminoid constituent of pus, related to mucin, possibly a mixture of substances rather than a single body.