PHANTASM

phantasm. Phantasm, n. a vain imagination, whim, vision

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Phan″tasm (?), n. [[L. phantasma. See Phantom, and cf. Fantasm.]] [Spelt also fantasm.] 1. 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. 2. 2. A mental image or representation of a real object; a fancy; a notion. Cudworth.
Figures or little features, of which the description had produced in you no phantasm or expectation. Jer. Taylor.