noun
a person who studies or is an expert in natural history
adjective
relating to or characteristic of a naturalist
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The naturalist conducted a detailed study of the local flora and fauna.
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My friend is a total naturalist - she loves spending time outdoors observing wildlife.
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I never knew I was such a naturalist until I went camping and fell in love with nature.
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As a naturalist of human behavior, she was able to predict how people would react in certain situations.