Ptis"an (?), n. [L. ptisana peeled barley, barley water, Gr. &?;, from &?; 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.