heliacal

[ hi-lahy-uh-kuhl ]
/ hɪˈlaɪ ə kəl /

adjective Astronomy.

pertaining to or occurring near the sun, especially applied to such risings and settings of a star as are most nearly coincident with those of the sun while yet visible.

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Also he·li·ac [hee-lee-ak]. /ˈhi liˌæk/.

Origin of heliacal

1600–10; <Late Latin hēliac(us) (<Greek hēliakós;see heli-1, -ac) + -al1

OTHER WORDS FROM heliacal

he·li·a·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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