astronomer

noun

as·​tron·​o·​mer ə-ˈsträ-nə-mər 

: a person who is skilled in astronomy or who makes observations of celestial phenomena

Examples of astronomer in a Sentence

Recent Examples on the Web

Tracking those appearances could help astronomers map the cluster's mass and refine measurements of the universe's expansion rate. — Samantha Mathewson, Space.com, 25 Sep. 2026

When such a fortuitous alignment occurs, amateur astronomers can discern things about the asteroid that professionals can’t readily measure, even with their giant telescopes on high mountains. — David Schneider, IEEE Spectrum, 24 Sep. 2026

Each ticket includes a seat in a heated, enclosed train car, along with a welcome toast, live music, astronomer insights, and access to the open-air stargazing car. — Evie Carrick, Travel + Leisure, 24 Sep. 2026

For decades, astronomers thought rings were something only giant planets had. — Jacek Krywko, ArsTechnica, 19 Sep. 2026

Word History

Etymology

Middle English, "one versed in astronomy or astrology," from astronomie astronomy + -er -er entry 2

Note: Alternatively, Oxford English Dictionary, third edition, and Middle English Dictionary see the English word as derived from Medieval and Late Latin astronomus "astronomer" (borrowed from Greek astronómos) plus the agent suffix -er.

First Known Use

14th century, in the meaning defined above

Rhymes for astronomer

• ionomer
• monomer