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

The findings are in keeping with reports from astronomers that SpaceX’s Starlink satellites are increasingly ruining their observations. —Chris Young, Interesting Engineering, 26 Jan. 2026

The giant mirrors at both sites let astronomers study fainter, more distant and more detailed targets. —Kenna Hughes-Castleberry, Space.com, 26 Jan. 2026

Now astronomers have traced dark matter’s ghostly contours in the foreground of one of JWST’s deep-sky images. —Joseph Howlett, Scientific American, 25 Jan. 2026

The catalogue of stars was created more than 2,100 years ago by the Greek astronomer Hipparchus. —Ethan Baron, Mercury News, 24 Jan. 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