Mizar

noun Mi·zar \ ˈmī-ˌzär \

Definition of Mizar

astronomy
: a group of stars of the second magnitude that is located near Alcor in the handle of the Big Dipper
  • Alcor and Mizar, in the bend of the handle of the Big Dipper, are actually a complex system. Alcor is a binary and Mizar is a quadruple system of two binary stars. Keen eyes can usually split Alcor and Mizar into individual stars, but you'll need a telescope to resolve the other companions.
  • —Becky RamotowskiSan Antonio Express-News21 June 2011
called also Zeta Ursae Majoris
Note: Although historically called a star, what we know as Mizar is actually a set of four separate stars, tightly bound together in two pairs by gravity.

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First Known Use of mizar

1812


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