Mid 19th century (in an earlier sense). From French rhoeadine from Hellenistic Greek ῥοιαδ-, ῥοιάς corn poppy (from ancient Greek ῥοιά, variant of ῥόα pomegranate (perhaps a loanword or perhaps from an ablaut variant of the base of ρεῖν to flow) + -άς, perhaps so called on account of its red flowers) + French -ine, after scientific Latin rhoeas, specific epithet (LinnaeusSpecies plantarum I. 507).