Etymology
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astronomer (n.)

"one versed in the laws of the heavenly bodies," late 14c., from astronomy (q.v.) + -er (1). It replaced French import astronomyen (c. 1300), which, had it survived, probably would have yielded *astronomian. For sense differentiation, see astrology and compare astrologer.

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Definitions of astronomer

astronomer (n.)
a physicist who studies astronomy;
Synonyms: uranologist / stargazer
From wordnet.princeton.edu