(Aramaic) from an unused root probably meaning to attenuate, i.e. (figuratively) hide; a mystery -- secret.
H7328. raz
רָז noun masculineDaniel 2:18 secret (ᵑ7 id., Syriac , , ; Persian loan-word; = Pahlavi r¹z, New Persian r¹z AndrM 83 *); — absolute ׳ר 4:6, emphatic רָזָא 2:18-19, 27, 30, 47; plural absolute רָזִין 2:28; 2:47, emphatic רָזַיָּא 2:29.