Etymology
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igloo (n.)

"dome-shaped Eskimo hut, usually made of blocks of hard snow," 1824, Canadian English, from an Eskimo word for "house, dwelling" (compare Greenlandic igdlo "house"). Of any dome-shaped construction, by 1956.

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Definitions of igloo

igloo (n.)
an Eskimo hut; usually built of blocks (of sod or snow) in the shape of a dome;
Synonyms: iglu
From wordnet.princeton.edu