Trap
From Memory Alpha, the free Star Trek reference
A trap is a physical device or a tactic used to catch someone or something.
In 2366, when a science project of Wesley Crusher's went wrong and some nanites escaped his laboratory, he put small traps all over the ship, including Ten Forward, in order to catch the tiny nanites. He was successful and caught at least one nanite. (TNG: "Evolution")
In 2372, when stranded on a planned dubbed New Earth, Captain Kathryn Janeway used traps to catch the native insects. (VOY: "Resolutions")
