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psythĭa, ae, v. psythius.
† psythĭus or psĭthĭus, a, um, adj., = ψύθιος (ψιθ-), psythian, a designation of a species of vine: vitis, Verg. G. 4, 269; Col. 3, 2, 24.
Called also simply psythĭa, ae, f., Verg. G. 2, 93; and in plur.: psythiae (sc. uvae), Stat. S. 4, 9, 38.
Neutr. subst.: psythĭum, ii, a kind of raisin-wine, Plin. 14, 9, 11, § 80.