Meaning of HELIAC

Pronunciation:			'heelee`ak
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WordNet Dictionary
	Definition:		[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)"
	Synonyms:		heliacal
Webster's 1913 Dictionary
	Definition:		\He"li*ac\, a. Heliacal.