Definition of Almach
: a group of stars of the second magnitude that is seen in the constellation of Andromeda The double star, known as Almach, reveals a brilliant contrast of color between the two stars. — Chris Pagan, Tulsa World, 2 Jan. 2011 —called also Gamma Andromedae ◆What is visible in the night sky as the star Almach is actually a group of four separate stars: one large star and a second group of three much smaller stars, bound together gravitationally.
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First Known Use of almach
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