noun, plural igloos.
an Eskimo house, being a dome-shaped hut usually built of blocks of hard snow.
Informal. any dome-shaped construction thought to resemble an igloo: immense silos topped with steel igloos.
Military. a dome-shaped building for the storage of rockets or other munitions.
an excavation made by a seal in the snow over its breathing hole in the ice.
Also, iglu.

1855–60; < Inuit iglu house

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World English Dictionary
igloo or iglu (ˈɪɡluː)
n , pl -loos, -lus
1.  a dome-shaped Inuit house, usually built of blocks of solid snow
2.  a hollow made by a seal in the snow over its breathing hole in the ice
[C19: from Inuktitut igdlu house]
iglu or iglu
[C19: from Inuktitut igdlu house]

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

1824, Canadian Eng., from an Eskimo word for "house, dwelling" (cf. Greenlandic igdlo "house").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was enough to make it clear that this was no igloo.
He rescued himself by quickly digging an igloo and warming himself inside it
  with a candle.
Each single igloo was a perishable item, but represented a tradition that lived
  until recently.
She promised a walrus in every igloo and a whale tooth in every papoose.
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