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The Collaborative International Dictionary of English v.0.48 (gcide)

Mirage \Mi`rage"\, n. [F., fr. mirer to look at carefully, to
aim, se mirer to look at one's self in a glass, to reflect,
to be reflected, LL. mirare to look at. See {Mirror}.]
An optical effect, sometimes seen on the ocean, but more
frequently in deserts, due to total reflection of light at
the surface common to two strata of air differently heated.
The reflected image is seen, commonly in an inverted
position, while the real object may or may not be in sight.
When the surface is horizontal, and below the eye, the
appearance is that of a sheet of water in which the object is
seen reflected; when the reflecting surface is above the eye,
the image is seen projected against the sky. The {fata
Morgana} and {looming} are species of mirage.
[1913 Webster]

By the mirage uplifted the land floats vague in the
ether,
Ships and the shadows of ships hang in the motionless
air. --Longfellow.
[1913 Webster]