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n. That which has only an apparent existence; an apparition; a specter; a phantasm; a sprite; an airy spirit; an ideal image. Phantom ship. See Flying Dutchman, under Flying. - Phantom tumor (Med.), a swelling, especially of the abdomen, due to muscular spasm, accumulation of flatus, etc., simulating an actual tumor in appearance, but disappearing upon the administration of an anæsthetic.