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

Dozens of observations by other telescopes were scheduled, which eventually enabled astronomers to rule out an impact with Earth. —Jamie Carter, Forbes.com, 18 June 2025

In future projects with this map, astronomers hope to explore how gas flows, changes its composition, and forms stars all across this large galaxy. —Laura Baisas, Popular Science, 18 June 2025

Each wavelength allowed astronomers to measure the invisible matter. —Ashley Strickland, CNN Money, 16 June 2025

Finally astronomers want to use the Rubin Observatory to understand dark matter, which has mass but doesn’t release or reflect light. —Stephanie Pappas, Scientific American, 16 June 2025

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