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

For years, astronomers have relied on a model called ΛCDM (Lambda–Cold Dark Matter) to describe how these ingredients work. —Rupendra Brahambhatt, Interesting Engineering, 29 Nov. 2025

Traditional astronomers may prefer the Unistellar eVscope 2, which is also on sale for Black Friday. —Harry Bennett, Space.com, 28 Nov. 2025

In the 1970s astronomers used a variation on this technique to get sharp images of several nearby large stars, including Antares in Scorpius and everyone’s favorite incipient supernova, Betelgeuse in Orion. —Phil Plait, Scientific American, 27 Nov. 2025

This may actually track, since astronomers still aren’t entirely certain how lenticular galaxies form in the first place. —Andrew Paul, Popular Science, 26 Nov. 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