• -ῐ́ον(-ĭ́on)

Perhaps neuter substantivisation of-ιος(-ios,“adjective suffix”), fromProto-Indo-European*-yós.

For the development from adjective to diminutive, compare Sanskrit-क(-ka) and Proto-Slavic*-ъka. From the development from adjective to place, compare Latin-ārium.(Canthis⁽⁺⁾ etymology besourced?)

-ῐον• (-ĭon) n (genitive-ῐ́ου);second declension

1. Termination of neuter substantivations of adjectives in-ιος(-ios,“belonging to”,also forms parasynthetic compounds).
2. A noun-forming diminutive suffix.
3. Suffix forming names for places.

• -εῖον(-eîon)

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