heliacal

adj.
Of or relating to the sun, especially rising and setting with the sun.

[From Late Latin hēliacus, from Greek hēliakos, from hēlios, sun.]

heliacally he·li'a·cal·ly adv.

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The adjective has one meaning:

Meaning #1: pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun
  Synonym: heliac
  Pertains to noun: sun (meaning #1)

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