a movable object that prevents passage of certain entities but allows passage of predefined entities, esp. a security barricade
A sliding gate is an active barrier; a retaining wall is a passive barrier.
- Active centre
noun (biochem) the region in an enzyme molecule in which the reactive groups that participate in its action are juxtaposed Also called active site Historical Examples Wallingford, six miles above Streatley, is a very ancient town, and has been an active centre for the making of English history. Three Men in a Boat Jerome K. […]
- Active chronic hepatitis
active chronic hepatitis active chronic hepatitis n. Hepatitis with chronic portal inflammation that extends into the liver parenchyma. Also called posthepatitic cirrhosis.
- Active dbms
active dbms database A conventional or passive DBMS combined with a means of event detection and condition monitoring. Event handling is often rule-based, as with an expert system. (1994-11-08)
- Active congestion
active congestion active congestion n. Congestion caused by an increased flow of arterial blood to a part of the body. Historical Examples In cases of active congestion the warm footbaths should be omitted and cold ones used from the commencement. Special Report on Diseases of the Horse United States Department of Agriculture With more probability […]
- Active directory
active directory operating system A directory service from Microsoft Corporation, similar in concept to Novell Netware Directory Services (NDS), that also integrates with the user organisation’s DNS structure and is interoperable with LDAP. Active Directory is included in Windows 2000. (2000-03-28)