Etymology : French, from mirer to look at, from Latin mirari
Pronunciation : m&-'räzh
Function : noun
Date : 1803
1. trick of eyesight, optical illusion, deceptive vision. 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. by the mirage uplifted the land floats vague in the ether, ships and the shadows of ships hang in the motionless air.
2. 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.
3. The reflected image is seen, commonly in an inverted position, while the real object may or may not be in sight.
4. 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.
5. The fata Morgana and looming are species of mirage. something illusory and unattainable an optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects.
6. 1. A mirage is something which you see:
when it is extremely hot, for example in the desert, and which appears to be quite near but is actually a long way away or does not really exist. It hovered before his eyes like the mirage of an oasis.
7. If you describe something as a mirage, you mean that it is not real or true, although it may seem to be. The girl was a mirage, cast up by his troubled mind = illusion. In optics, the deceptive appearance of a distant object caused by the bending of light rays (refraction) in layers of air of varying density. Under certain conditions, such as over a stretch of pavement or desert air heated by intense sunshine, the air cools rapidly with elevation and therefore increases in density and refractive power. Sunlight reflected down from the upper portion of an object will be directed through the cool air in the normal way; although the light would not be seen ordinarily because of the angle, it curves upward after it enters the rarefied hot air near the ground, thus being refracted to the observer's eye as though it had originated below the heated surface. When the sky is the object of the mirage, the land is mistaken for a lake or sheet of water.