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Definition of: heliacal
(hi·lī′ə·kəl) adjective Astron.
1. Pertaining to the sun.
2. Designating those risings and settings of the stars that take place as near the sun as they can be observed. Also he·li·ac (hē′lē·ak). [<LL heliacus <Gk. hēliakos <hēlios the sun]
—he·li′a·cal·ly adverb
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