astro-

combining form

: star : heavens : outer space : astronomy
astrophysics

Word History

Etymology

borrowed from Greek, combining form from ástron "star" — more at star entry 1

Dictionary Entries Near astro-

astringent root

astro-

astrobiology

See More Nearby Entries 

Cite this Entry

“Astro-.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astro-. Accessed 16 Nov. 2024.

Copy Citation

Share

Kids Definition

astro-

combining form
: star : heavens : outer space : astronomical
astrophysics
Etymology

Latin astro- "star," derived from Greek astēr, astron "star"

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Popular in Grammar & Usage

See All

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)

Plural and Possessive Names: A Guide

The Difference Between 'i.e.' and 'e.g.'

Why is '-ed' sometimes pronounced at the end of a word?

What's the difference between 'fascism' and 'socialism'?
See All

Popular in Wordplay

See All

8 Words with Fascinating Histories

8 Words for Lesser-Known Musical Instruments

Birds Say the Darndest Things

10 Words from Taylor Swift Songs (Merriam's Version)

10 Scrabble Words Without Any Vowels
See All

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Word Game Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
Missing Letter A daily crossword with a twist
silhouette of a man with a megaphone against a british flag
Another Great British Vocabulary Quiz, Innit? A double-decker quiz with words from across the pond