First Known Use: 1545
Dictionary
heliacal
adjective he·li·a·cal \hi-ˈlī-ə-kəl\
Definition of HELIACAL
: relating to or near the sun —used especially of the last setting of a star before and its first rising after invisibility due to conjunction with the sun
— he·li·a·cal·ly \-k(ə-)lē\ adverb
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Origin of HELIACAL
Late Latin heliacus, from Greek hēliakos, from hēlios
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