noun
: a theory that explains the peculiar features of such stars as the Cepheid variables by assuming an expansion and contraction of the star as a whole in a regular periodic pulsation
noun
: a theory that explains the peculiar features of such stars as the Cepheid variables by assuming an expansion and contraction of the star as a whole in a regular periodic pulsation
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012