Definify.com
Webster 1913 Edition
Phantasm
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.
Webster 1828 Edition
Phantasm
PHAN'TASM
,Noun.
That which appears to the mind; the image of an external object; hence, an idea or notion. It usually denotes a vain or airy appearance; something imagined.
All the interim is
Like a phantasm or a hideous dream.