noun
A person who explores altered states of consciousness, often through the use of psychedelics or other mind-altering substances
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The psychonaut embarked on a journey to explore altered states of consciousness.
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The psychonaut is always trying out new mind-altering experiences.
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Dude, that guy is a total psychonaut, always tripping on something.
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She was a psychonaut of the mind, delving into the depths of her own thoughts and emotions.