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In page Persephone:

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The etymology of the word "Persephone" is obscure. According to a recent hypothesis advanced by Rudolf Wachter, the first element in the name (Perso- (Περσο-) may well reflect a very rare term, attested in the Rig Veda (Sanskrit parṣa-), and the Avesta, meaning "sheaf of corn" / "ear [of grain]". The second constituent, phatta, preserved in the form Persephatta (Περσεφάττα), would in this view reflect Proto-Indo-European *-gʷn-t-ih, from the root *gʷʰen- "to strike / beat / kill". The combined sense would therefore be "she who beats the ears of corn", i.e., a "thresher of grain"[8] (Περσ (Perse) refers to "grains", εφό (phó) refers to "hitting"/"striking" and -νη (-nē) is a female matronymic suffix; an apropos name for the daughter of Demeter, the goddess of the harvest).[citation needed]