ῥήου ῥῆον, rhubarb Morpho works with a static database. If you like, you can compare the output of Morpheus.Parsed as: ✓ neuter genitive singular of ῥῆον ῥῆον Neuter SingularDualPlural Nominative – – – Genitive ῥήου – – Dative – – – Accusative – – – Vocative – – –