active barrier

Main Entry:  active barrier1
Part of Speech:  n
Definition:  an object that prevents passage of certain entities but allows passage of predefined entities, esp. a chemical or physical barricade for contaminants or debris
Dictionary.com's 21st Century Lexicon
Main Entry:  active barrier2
Part of Speech:  n
Definition:  a movable object that prevents passage of certain entities but allows passage of predefined entities, esp. a security barricade
Example:  A sliding gate is an active barrier; a retaining wall is a passive barrier.
Dictionary.com's 21st Century Lexicon
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