A variable star of a class of which Mira (ο Ceti) is considered typical, characterized by fluctuation in brightness in a roughly regular cycle with a comparatively long period.
Origin
Early 20th century.
Definition of Mira variable in US English:
Mira variable
noun
Astronomy
A variable star of a class of which Mira (ο Ceti) is considered typical, characterized by fluctuation in brightness in a roughly regular cycle with a comparatively long period.