ac·tive bar·ri·er • n. a barrier that allows passage of defined agents while preventing or impeding others, in particular: ∎ a security barrier that responds to attempted entries with sensors or personnel. ∎ a physical or chemical barrier that intercepts contaminants or other unwanted substances.
"active barrier." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (January 17, 2019). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/active-barrier
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