A derivation from εἶμῐ (eîmi, “to go or come”) with a suffix -θμο- has been assumed, comparing also Old Norse eið (“isthmus”). However, the -σ- is unexplained, so the word could well be of Pre-Greek origin.
ῐ̓σθμός • (isthmós) m (genitive ῐ̓σθμοῦ); second declension
Case / # | Singular | Dual | Plural | ||||||||||
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Nominative | ὁ ῐ̓σθμός ho isthmós |
τὼ ῐ̓σθμώ tṑ isthmṓ |
οἱ ῐ̓σθμοί hoi isthmoí | ||||||||||
Genitive | τοῦ ῐ̓σθμοῦ toû isthmoû |
τοῖν ῐ̓σθμοῖν toîn isthmoîn |
τῶν ῐ̓σθμῶν tôn isthmôn | ||||||||||
Dative | τῷ ῐ̓σθμῷ tôi isthmôi |
τοῖν ῐ̓σθμοῖν toîn isthmoîn |
τοῖς ῐ̓σθμοῖς toîs isthmoîs | ||||||||||
Accusative | τὸν ῐ̓σθμόν tòn isthmón |
τὼ ῐ̓σθμώ tṑ isthmṓ |
τοὺς ῐ̓σθμούς toùs isthmoús | ||||||||||
Vocative | ῐ̓σθμέ isthmé |
ῐ̓σθμώ isthmṓ |
ῐ̓σθμοί isthmoí | ||||||||||
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