wave theory: (physics) the theory that light is transmitted as waves
scientific theory: a theory that explains scientific observations
solanaceae: large and economically important family of herbs or shrubs or trees often strongly scented and sometimes narcotic or poisonous; includes the genera Solanum, Atropa, Brugmansia, Capsicum, Datura, Hyoscyamus, Lycopersicon, Nicotiana, Petunia, Physalis, and Solandra