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

While the mission was designed with dark energy, dark matter, and exoplanets in mind, Roman’s unprecedented observational capability will offer practically limitless opportunities for astronomers to explore all kinds of cosmic topics. —Richard Tribou, The Orlando Sentinel, 1 May 2026

Four years ago, Ars reported that astronomers believed another Falcon 9 upper stage would strike the Moon. —Stephen Clark, ArsTechnica, 1 May 2026

That is according to Bill Gray, an astronomer who created an object-tracking software called Project Pluto. —Chris Young, Interesting Engineering, 1 May 2026

The wayward booster was spotted by independent astronomer Bill Gray, who develops and sells software dedicated to tracking celestial objects both artificial and natural. —Adam Kovac, Scientific American, 1 May 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