Probably a loanword. According to Donatus, it is of Phrygian origin, a path followed by Thumb, who considers Proto-Celtic to be the ultimate source, comparing Irish rúsc (“bark of a tree”). The word would have reached Greek from Galatian, through Phrygian because of the change u > i. Anyway, Beekes doesn't dismiss a Pre-Greek origin.
ῥῐ́σκος • (rhískos) m (genitive ῥῐ́σκου); second declension
Case / # | Singular | Dual | Plural | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Nominative | ὁ ῥῐ́σκος ho rhískos |
τὼ ῥῐ́σκω tṑ rhískō |
οἱ ῥῐ́σκοι hoi rhískoi | ||||||||||
Genitive | τοῦ ῥῐ́σκου toû rhískou |
τοῖν ῥῐ́σκοιν toîn rhískoin |
τῶν ῥῐ́σκων tôn rhískōn | ||||||||||
Dative | τῷ ῥῐ́σκῳ tôi rhískōi |
τοῖν ῥῐ́σκοιν toîn rhískoin |
τοῖς ῥῐ́σκοις toîs rhískois | ||||||||||
Accusative | τὸν ῥῐ́σκον tòn rhískon |
τὼ ῥῐ́σκω tṑ rhískō |
τοὺς ῥῐ́σκους toùs rhískous | ||||||||||
Vocative | ῥῐ́σκε rhíske |
ῥῐ́σκω rhískō |
ῥῐ́σκοι rhískoi | ||||||||||
Notes: |
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