01 n. An image formed by the mind, and supposed to be real or material; a shadowy or airy appearance; sometimes, an optical illusion; a phantom; …
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1.
An image formed by the mind, and supposed to be real or material; a shadowy or airy appearance; sometimes, an optical illusion; a phantom; a dream.“They be but phantasms or apparitions.” — Sir W. Raleigh.
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2.
A mental image or representation of a real object; a fancy; a notion.“Figures or little features, of which the description had produced in you no phantasm or expectation.” — Jer. Taylor.