正時しょうじ Noun Noun Adverb Adverb English jmdict 1 noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no' adverb (fukushi) adverb taking the 'to' particle (on) the hour
毎正時まいしょうじ Noun Noun Adverb English jmdict 1 noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no' adverb (fukushi) every hour on the hour usu. as 毎正時に