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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for oso
With bodies recovered from the landslide but no names released, the town of Oso hopes for the best and anticipates the worst.
He looks so much like a young bear that we call him Oso, which is Spanish for bear.