The production of various glazes, if not glass itself, goes back to the 3rd millennium BCE, so the origin of the term (see Akkadian zakūkūtu, zakakatu, only in SB texts, so probably West Semitic, Biblical Hebrew זְכוֹכִית) remains uncertain; for the history see W. Reade, “Glass”, in D.T. Potts (ed.), A companion to the Archaeology of the Ancient Near East, pp. 317-335 (Wiley-Blackwell, 2012).