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 teams of astronomers have looked for clues about the movements of giant planets in the orbits of asteroids and other small objects, studying them like footprints to reconstruct how they might have been pushed or pulled into their current orbits by the gravity of giant planets on the move. —Kiona N. Smith, Space.com, 29 May 2026

This is no coincidence; galactic mergers are more likely at the cluster’s gravitational center, and astronomers think the chaos of such collisions helps give ellipticals their characteristic spheroidal shape. —Phil Plait, Scientific American, 29 May 2026

The astronomers made their case for a solution—and the government listened. —Encyclopedia Britannica, 29 May 2026

When the telescope arrived in the early 1600s, astronomers such as Galileo Galilei, Christoph Scheiner, and Johannes Fabricius turned these instruments toward this nearest star, projected the image onto paper, and saw dark blemishes drifting slowly across the solar surface. —Quanta Magazine, 28 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