- a star, the fifth-magnitude companion of Mizar in the handle of the Big Dipper.
Origin of Alcor
perhaps < Arabic al-khawr the low ground
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for alcor
Alcor (al´-kôr), g Ursæ Majoris, "the cavalier" or "the rider."A Field Book of the Stars
William Tyler Olcott
Its distance is a little over half that between Mizar and Alcor.Astronomy with an Opera-glass
Garrett Putman Serviss
They saw and named Alcor, thousands of years before telescopes were invented, and long before there were any books to help them.Earth and Sky Every Child Should Know
Julia Ellen Rogers
Just above it is a very small star that astronomers call Alcor, or the rider.
The naked eye perceives near it a smaller star, named Alcor.Pleasures of the telescope