Uncertain. Typically has been compared with the root of πίμπλημι (pímplēmi, “I fill up”) (< Proto-Indo-European *pípleh₁mi) (cf. πλήθω (plḗthō) and πληθῡ́ς (plēthū́s) (< *pléh₁-dʰeh₁-) + -θρον (-thron), in which case it could be from Proto-Indo-European *pléh₁dʰrom, though long *ή (*ḗ) would be expected. However, the phonetic alternations in πέλεθρον (pélethron) and βλέθρον (bléthron) suggest a more complicated origin. According to Beekes, it is probably a loanword.
The word may be cognate with Mycenaean Greek 𐀤𐀩𐀴𐀍 (qe-re-ti-jo); if so, the original form must have begun with a labiovelar such as */kʷ/, rather than /p/ or /b/.
πλέθρον • (pléthron) n (genitive πλέθρου); second declension
Case / # | Singular | Dual | Plural | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Nominative | τὸ πλέθρον tò pléthron |
τὼ πλέθρω tṑ pléthrō |
τᾰ̀ πλέθρᾰ tà pléthra | ||||||||||
Genitive | τοῦ πλέθρου toû pléthrou |
τοῖν πλέθροιν toîn pléthroin |
τῶν πλέθρων tôn pléthrōn | ||||||||||
Dative | τῷ πλέθρῳ tôi pléthrōi |
τοῖν πλέθροιν toîn pléthroin |
τοῖς πλέθροις toîs pléthrois | ||||||||||
Accusative | τὸ πλέθρον tò pléthron |
τὼ πλέθρω tṑ pléthrō |
τᾰ̀ πλέθρᾰ tà pléthra | ||||||||||
Vocative | πλέθρον pléthron |
πλέθρω pléthrō |
πλέθρᾰ pléthra | ||||||||||
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