Dictionary.com
Thesaurus.com

Sinus Meridianii

American  
[see-nuhs muh-rid-ee-ah-nee-ee, sahy-nuhs muh-rid-ee-ey-nee-ahy] / ˈsi nəs məˌrɪd iˈɑ niˌi, ˈsaɪ nəs məˌrɪd iˈeɪ niˌaɪ /

noun

  1. an area on the equator of Mars, appearing as a dark region when viewed telescopically from the earth.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Vocabulary.com logo
by dictionary.com

Join 12,000,000 vocabulary learners

Start learning new words today on VocabTrainer.
You'll remember them forever.

Start training