counterscreen

== English == === Alternative forms === counter-screen === Etymology === From counter- +‎ screen. === Noun === counterscreen (plural counterscreens) A screen (or screening), carried out in parallel to a primary screen, in which compounds that could interfere with the primary screen may be identified === Verb === counterscreen (third-person singular simple present counterscreens, present participle counterscreening, simple past and past participle counterscreened) To separate components using such a device