is·me·ne \izˈmē(ˌ)nē\noun Etymology: New Latin, from Latin Ismene, daughter of Oedipus, from Greek Ismēnē 1.capitalized, in some classifications: a genus of So. American bulbous perennial herbs that have incurved filaments projecting beyond the margin of the floral cup and are usually included in the genus Hemerocallis 2.-s: peruvian daffodil