Top Definition
An onsen is a Japanese style public bath using volcanically heated hot water from the ground.

The term onsen is often used in the Japanese language in reference to the bathing facilities surrounding hot springs.

Onsen, when translated into English means 'hot spring', which can lead to confusion and miscommunication.
After watching the monkeys in the hot spring, do you want to go to an onsen?
by 7 years in August 19, 2013

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