Medicine. 1  hs, medical abbreviation for hours of sleep. 2  h.s., medical abbreviation for the Latin phrase hora somni (at bedtime) 3  Hereditary spherocytosis, a genetic disorder marked by hemolytic anemia.  Hidradenitis suppurativa, a skin condition affecting apocrine sweat glands and hair follicles.
Anti-Defamation League. For other uses, see Anti-Defamation League (disambiguation). The Anti-Defamation League (ADL; formerly known as the Anti-Defamation League of B'nai B'rith) is an international Jewish non-governmental organization based in the United States.
Stands for Access Control List.. An ACL is a list of user permissions for a file, folder, or other object. It defines what users and groups can access the object and what operations they can perform. These operations typically include read, write, and execute.