Pronunciation: (fan'tum),[key] —n. 1. an apparition or specter.
2. an appearance or illusion without material substance, as a dream image, mirage, or optical illusion.
3. a person or thing of merely illusory power, status, efficacy, etc.: the phantom of fear. 4. 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.
—adj. 1. of, pertaining to, or of the nature of a phantom; illusory: a phantom sea serpent. 2. Elect.noting or pertaining to a phantom circuit.
3. named, included, or recorded but nonexistent; fictitious: Payroll checks were made out and cashed for phantom employees.Also,fantom.