<p><strong>Noun</strong></p><ul><li>an apparition or specter.</li><li>an appearance or illusion without material substance, as a dream image, mirage, or optical illusion.</li><li>a person or thing of merely illusory power, status, efficacy, etc.: the phantom of fear.</li><li>an illustration, part of which is given a transparent effect so as to permit representation of details otherwise hidden from view, as the inner workings of a mechanical device.</li></ul><p><strong>Adjective</strong></p><ul><li>of, relating to, or of the nature of a phantom; illusory: a phantom sea serpent.</li><li>Synonyms: imaginary.</li><li>Antonyms: material, real.</li><li>noting or pertaining to a phantom circuit.</li><li>named, included, or recorded but nonexistent; fictitious: Payroll checks were made out and cashed for phantom employees.</li></ul>