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Latin word nocere comes from Proto-Indo-European *enḱ-, and later Proto-Italic *nokeō (Harm, hurt, injure. Kill, slay violently.)
*enḱ- (Proto-Indo-European)
to reach; to obtain; to carry
*nokeō (Proto-Italic)
Harm, hurt, injure. Kill, slay violently.
nocere (Latin)