a sweetened dessert with whipped cream as a base, often stabilized with gelatin and chilled in a mold: chocolate mousse.
an aspic, unsweetened and containing meat, vegetables, or fish: salmon mousse.
a foamy preparation used on the hair to help hold it in place, applied usually to damp hair before grooming or styling and worked in until absorbed.

1890–95; < French: moss, froth < Germanic; see moss

mouse, mousse. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mousse (muːs)
1.  a light creamy dessert made with eggs, cream, fruit, etc, set with gelatine
2.  a similar dish made from fish or meat
3.  the layer of small bubbles on the top of a glass of champagne or other sparkling wine
4.  short for styling mousse
[C19: from French: froth]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1892, from Fr. mousse, from O.Fr. mousse "froth, scum," from L.L. mulsa "mead," from L. mulsum "honey wine, mead," from neut. of mulsus "mixed with honey," related to mel "honey." Meaning "preparation for hair" is from 1970s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


savoury or sweet dish with the consistency of a dense foam, composed of a pureed chief ingredient mixed with stiffly beaten egg whites, whipped cream, or both. Mousses are almost always cold dishes, sweet mousses sometimes being served frozen. Savoury mousses are frequently prepared from poultry, foie gras, fish, or shellfish, to be eaten as a first course or light entree. They may be stabilized by the addition of gelatin.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The oil left behind becomes thicker and forms a sort of mousse that is less
  susceptible to dispersants.
Try the honeyed mascarpone tofu on baguette or the liver mousse with figs.
Consisting of little besides excellent rich chocolate mousse, it delivers an
  irrefutable argument for simplicity.
And this mousse is an easy way to incorporate chocolate without being overly
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