astrogeology

noun

as·​tro·​geology

¦as(ˌ)trō +

: a branch of geology that deals with celestial bodies

astrogeologic

¦astrō +

adjective

astrogeologist

¦as(ˌ)trō +

noun

Word History

Etymology

astr- + geology

First Known Use

1883, in the meaning defined above

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!