A nadion emitter was a component aboard a Federation starship. It was, as its name suggests, a type of emitter that produced nadions. Defiant-class starships had multiple nadion emitters.

In 2375, while preparing the USS Defiant for launch from space station Deep Space 9, Lieutenant Commander Worf ordered Ensign Nog to "collimate the nadion emitters," to which Nog replied, "Collimation sequence in progress." (DS9: "The Changing Face of Evil")

In the first draft script of "The Changing Face of Evil", Worf didn't mention the nadion emitters and instead commented to Nog that he wanted the Defiant ready to depart from DS9 as soon as Captain Sisko arrived, and that that included the communications array, a statement to which Nog simply replied, "Aye, sir."
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