na ‧ tur ‧ ist /ˈneɪtʃərəst, ˈneɪtʃərɪst/ BrE AmE noun [countable]
[ Word Family: noun : ↑ nature , ↑ naturalist , ↑ naturalism , ↑ naturalization , ↑ naturalness , the supernatural, ↑ natural , ↑ naturist , ↑ naturism ; adverb : ↑ naturally ≠ ↑ unnaturally , ↑ naturalistically , ↑ supernaturally ; adjective : ↑ natural ≠ ↑ unnatural , ↑ supernatural , ↑ naturalistic ; verb : ↑ naturalize ]
someone who enjoys not wearing any clothes because they believe it is natural and healthy to do this SYN nudist
—naturism noun [uncountable]