See also: Cgm English English Wikipedia has an article on:CGMWikipedia Noun CGM (countable and uncountable, plural CGMs) (countable, astronomy) Initialism of circumgalactic medium. Coordinate terms: IGM, ICM, ISM, IPM (countable, medicine) Initialism of continuous glucose monitor. (uncountable, medicine) Initialism of continuous glucose monitoring. Anagrams CMG, GCM, GMC, Gmc, MCG, MGCWikiwand - on Seamless Wikipedia browsing. On steroids.