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heliacal Syllabification: he·li·a·cal
Pronunciation: /həˈlīəkəl/

Definition of heliacal in English:


Relating to or near the sun.
Example sentences
  • It is possible that all the planetary orbs originate from an early attempt to record heliacal obscurity.
  • All ancient astrologers placed the greatest significance upon heliacal risings and settings and ancient Mesopotamian astrology was also heavily predisposed to observance of this kind of planetary phenomena.
  • The Greeks and Romans, with fairly useless calendars, continued to depend upon observing the heliacal risings and settings of stars.


Mid 16th century: via late Latin from Greek hēliakos (from hēlios 'sun') + -al.

Definition of heliacal in:
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