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

Other astronomers spent decades challenging his interpretation. —David W. Brown, New Yorker, 13 Sep. 2025

That unprecedented clarity allowed astronomers to use GW250114 to confirm predictions about black holes made decades ago by prominent physicists. —Jacopo Prisco, CNN Money, 11 Sep. 2025

Thus, astronomers have been diligently hunting for quasars that existed during Cosmic Dawn, a period lasting from around 50 million to one billion years after the Big Bang, when the first stars and galaxies are believed to have formed. —Robert Lea, Space.com, 11 Sep. 2025

As geologists were realizing that earthly timescales were vast, astronomers began to discover that the same applied to the distances of the cosmos. —Big Think, 9 Sep. 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