NATURALIST
naturalist, natural scientist
(noun) a biologist knowledgeable about natural history (especially botany and zoology)
naturalist
(noun) an advocate of the doctrine that the world can be understood in scientific terms
Source: WordNet® 3.1
Etymology
Noun
naturalist (plural naturalists)
(obsolete, except as merged with later senses) A natural philosopher; a scientist. [16th–19th c.]
(philosophy) A person who believes in or advocates the tenets of philosophical or methodological naturalism. [from 16th c.]
An expert in natural history or the study of plants and animals. [from 17th c.]
(art) A creative artist who attempts to faithfully represent nature; an adherent of artistic naturalism. [from 19th c.]
Source: Wiktionary
Nat"u*ral*ist, n. Etym: [Cf. F. naturaliste.]
1. One versed in natural science; a student of natural history, esp.
of the natural history of animals.
2. One who holds or maintains the doctrine of naturalism in religion.
H. Bushnell.
Source: Webster’s Unabridged Dictionary 1913 Edition