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(Science: botany) A plant of the genus iris (I. Florentina); a kind of flower-de-luce. Its rootstock has an odour resembling that of violets.
(Science: medicine) Orris pea, an issue pea made from orris root. Orris root, the fragrant rootstock of the orris.
Origin: Prob. Corrupted from It. Ireos iris. See Iris.