['fæntәzm]
n.
幻觉

Fantasm \Fan"tasm\, n. [See {Phantasm}, {Fancy}.]
Same as {Phantasm}.

Phantasm \Phan"tasm\, n. [L. phantasma. See {Phantom}, and cf.
{Fantasm}.] [Spelt also {fantasm}.]
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. 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.