Entry 2 senses Webster, 1913 Igloo /ĭg'-lo͞o/ · Ig·loo · IPA /ˈɪɡ.luː/ 01 n. An Eskimo snow house. 1. An Eskimo snow house. 2. A cavity, or excavation, made in the snow by a seal, over its breathing hole in the ice.(Zool.)