black currant liquor, 1907, from French cassis (16c.) "black currant," apparently from Latin cassia (see cassia). The modern liqueur dates from mid-19c.
Entries linking to cassis
cassia n.
cinnamon-like plant of tropical regions, late Old English, from Latin cassia, from Greek kasia, from Hebrew q'tsi-ah "cassia," from qatsa "to cut off, strip off bark."