Definify.com
Webster 1913 Edition
Ptisan
Ptis′an
,Noun.
 [L. 
ptisana 
peeled barley, barley water, Gr. [GREEK], from [GREEK] to peel, husk; cf. F. ptisane
, tisane
.] 1. 
A decoction of barley with other ingredients; a farinaceous drink. 
2. 
(Med.) 
An aqueous medicine, containing little, if any, medicinal agent; a tea or tisane. 
Webster 1828 Edition
Ptisan
PTISAN
,Noun.
 A decoction of barley with other ingredients.