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mirage

American  
[mi-rahzh] / mɪˈrɑʒ /

noun

  1. an optical phenomenon, especially in the desert or at sea, by which the image of some object appears displaced above, below, or to one side of its true position as a result of spatial variations of the index of refraction of air.

  2. something illusory, without substance or reality.

    Synonyms:
    fancy, phantom, illusion
  3. Military. Mirage, any of a series of supersonic, delta-wing, multirole French fighter-bombers.


mirage British  
/ mɪˈrɑːʒ /

noun

  1. an image of a distant object or sheet of water, often inverted or distorted, caused by atmospheric refraction by hot air

  2. something illusory

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mirage Scientific  
/ mĭ-räzh /
  1. An image formed under certain atmospheric conditions, in which objects appear to be reflected or displaced or in which nonexistent objects seem to appear. For example, the difference in the index of refraction between a low layer of very hot air and a higher level of cold air can cause light rays, travelling down from an object (such as the sky or a cloud) and passing through ever warmer air, to be refracted back up again. An observer viewing these light rays perceives them coming up off the ground, and thus sees the inverted image of the object, which appears lower than the object really is. In this way the sky itself can be reflected, resulting in the mirage of a distant lake.


Etymology

Origin of mirage

First recorded in 1795–1805; from French, equivalent to (se) mir(er) “to look at (oneself), be reflected” (from Latin mīrārī “to wonder at”) + -age -age

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

When you’re depleted after a couple of days of hard running, seeing something that may indicate your suffering is over is almost like seeing a mirage.

From The Wall Street Journal

But when there’s a glitch, this mirage breaks.

From The Wall Street Journal

The Hims & Hers strategy of undercutting patented drugs arguably went too far and always seemed like a mirage, as far as strategy goes.

From The Wall Street Journal

The results of the hunt were so disappointing that in 1922 an American geologist dismissed the country’s petroleum prospects as a “mirage.”

From The Wall Street Journal

Even if Leman isn’t our grandmother, she is, by the end, our grand mirage.

From The Wall Street Journal