De·neb·o·la (də-něb'ə-lə) n. A star in the constellation Leo, approximately 43 light-years from Earth.
[From shortening of Arabic ḏanab al-'asad, tail of the lion : ḏanab, tail; see ḏnb in Semitic roots + al-, the + 'asad, lion; see šd in Semitic roots.]