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

To separate components using such a device

plural of counterscreen

plural of counterselection

(genetics) Capable of creating a counterselection

simple past tense and past participle of counterselect

To undergo counterselection

(biology) Relating to counterselection

Having countershading

Third-person singular simple present indicative form of counterselect