сокращение от house in multiple occupation общежитие, (жилой) дом гостиничного типа (с кухней, ванной, туалетом в общем пользовании)
медицинский термин, употребляется в США сокращение от health maintenance organization
noun an organization that provides comprehensive health care to voluntarily enrolled individuals and families in a particular geographic area by member physicians with limited referral to outside specialists and that is financed by fixed periodic payments determined in advance — called also health maintenance organization