Dictionary.com

OSO

Save This Word!

U.S. Aerospace.
Orbiting Solar Observatory: one of a series of scientific satellites, launched between 1962 and 1975, that studied the sun at ultraviolet, x-ray, and gamma-ray wavelengths.
QUIZ
FIRE UP YOUR VOCAB FOR A "RED" SYNONYMS QUIZ
No fire engine reds here, only a fierce collection of vibrant words for the color red to test yourself on.
Question 1 of 7
What does "amaranth" mean?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use OSO in a sentence

FEEDBACK