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heliacal

[hi-lahy-uh-kuh l] /hɪˈlaɪ ə kəl/
adjective, Astronomy
1.
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.
Also, heliac
[hee-lee-ak] /ˈhi liˌæk/ (Show IPA)
.
Origin
1600-1610
1600-10; < Late Latin hēliac(us) (< Greek hēliakós; see heli-1, -ac) + -al1
Related forms
heliacally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for heliac
heliacal
"pertaining to the sun," 1607, from Gk. heliakos "of the sun," from helios "sun" (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; it is also known as the canicular year.
Online Etymology Dictionary, © 2010 Douglas Harper
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