Etymology
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tisane (n.)

medicinal tea, 1931, from French tisane; earlier ptisan (14c.), from Latin ptisana, from Greek ptisane "crushed barley," related to ptissein "to winnow, crush, peel" (see pestle).

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Definitions of tisane

tisane (n.)
infusion of e.g. dried or fresh flowers or leaves;
From wordnet.princeton.edu