Source : Webster's Revised Unabridged Dictionary (1913)

Heliac \He"li*ac\, a.
   Heliacal.

Source : WordNet®

heliac
     adj : pertaining to or near the sun; especially the first rising
           of a star after and last setting before its
           invisibility owing to its conjunction with the sun;
           "the heliacal rising of the Dog Star"; "the heliacal or
           Sothic year is determined by the heliacal rising of
           Sothis (the Egyptian name for the Dog Star)" [syn: {heliacal}]