noun

• Initialism of human chorionic gonadotropin. [(medicine, biochemistry) A peptide hormone, produced during pregnancy, that prevents the breakdown of the corpus luteum and maintains progesterone production.]
• (astronomy) Abbreviation of Hickson compact group. [(astronomy) A collection of galaxies designated as published by Paul Hickson in 1982.]
• (medicine) Abbreviation of HLA complex group. (human leukocyte antigen complex group)
• (medicine) Abbreviation of human chorionic gonadotropin. [(medicine, biochemistry) A peptide hormone, produced during pregnancy, that prevents the breakdown of the corpus luteum and maintains progesterone production.]