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Superficially, a compound of 天(ama, “sky, the heavens”) + 照らす(terasu, “to illuminate something, to shine upon something”). However, this derives instead as an honorific form of compound verb 天照る(amateru, “to shine in heaven”), as the 照らす(terasu) is not the usual transitive or causative conjugation of the intransitive verb 照る(teru, “to shine, to light up”), but rather an example of the verb with the Old Japanese honorific verb suffix す(-su).[3][4][5]
As a verbal epithet, also found in some older texts with the reading Amaderasu,[3][4] where the terasu changes to derasu as an instance of rendaku (連濁). The name appears to be consistently used without voicing, as Amaterasu.[6][7]