Definition of infinity pool noun from the Oxford Advanced Learner's Dictionary

 

infinity pool

 noun
noun
BrE
 
; NAmE
 
 
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a swimming pool that is specially designed so that, when you are in it, the pool seems to stretch to the horizon (= where the sky seems to meet the land or sea) A large infinity pool faces the ocean. Enjoy floating in the infinity pool under the hot sun.
See the Oxford Advanced American Dictionary entry: infinity pool