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出典:Wiktionary
From Ancient Greek Κάϊν (Káïn), in turn from Biblical Hebrew קַיִן (Qayin). The stress on the penultimate is extrapolated from the descended Italian Caino and Spanish Caín, but it is no proof of vocalic length and even contrasts with the original Greek.
Caīnus m sg (genitive Caīnī); second declension
Second-declension noun, singular only.
Cainus