[hi-lahy-uh-kuh l]
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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 he·li·ac [hee-lee-ak] /ˈhi liˌæk/.

Origin of heliacal

1600–10; < Late Latin hēliac(us) (< Greek hēliakós; see heli-1, -ac) + -al1
Related formshe·li·a·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for heliacal

cosmic, stellar, empyreal, heliacal

Examples from the Web for heliacal

Historical Examples of heliacal

Word Origin and History for heliacal

"pertaining to the sun," c.1600, with -al (1) and Greek heliakos "of the sun," from helios "sun" (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; thus it also is known as the canicular year.

Online Etymology Dictionary, © 2010 Douglas Harper