ὀστρείοισιν ὄστρεον, an oyster Morpho works with a static database. If you like, you can compare the output of Morpheus.Parsed as: neuter dative plural (morph21) of ὄστρεον Search the corpus for this form only: ὀστρείοισιν ὄστρεον Neuter SingularDualPlural Nominative – – – Genitive – – ὀστρείων Dative ὀστρείῳ – – Accusative – – ὄστρεά Vocative – – –