C14: from Old French tisane, from Latin ptisana, from Greek ptisanē barley groats
ptisan in American English
(ˈtɪzən; tɪˈzæn)
noun
1.
a drink made by boiling down barley with water and other ingredients; barley water
2.
any similar decoction, as of herbs
Word origin
ME tysane < MFr tisane < VL tisana, for L ptisana, barley groats, drink made from barley groats < Gr ptisanē, peeled barley < ptissein, to peel < IE base *pis-, to crush > L pinsere, to beat, crush