Usually means: Rising with the sun; astronomical.
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We found 19 dictionaries that define the word heliacal:

General (18 matching dictionaries)
  1. heliacal: Merriam-Webster
  2. heliacal: Oxford Learner's Dictionaries
  3. heliacal: American Heritage Dictionary of the English Language
  4. heliacal: Vocabulary.com
  5. heliacal: Wordnik
  6. heliacal: Wiktionary
  7. heliacal: Webster's New World College Dictionary, 4th Ed.
  8. heliacal: Infoplease Dictionary
  9. Heliacal, heliacal: Dictionary.com
  10. Heliacal: Online Plain Text English Dictionary
  11. heliacal: Webster's Revised Unabridged, 1913 Edition
  12. heliacal: Rhymezone
  13. Heliacal: AllWords.com Multi-Lingual Dictionary
  14. heliacal: Webster's 1828 Dictionary
  15. heliacal: FreeDictionary.org
  16. heliacal: Mnemonic Dictionary
  17. heliacal: TheFreeDictionary.com
  18. heliacal: Online Etymology Dictionary

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

(Note: See heliacally as well.)

Definitions from Wiktionary (heliacal)

adjective:  (rare) Of or relating to the Sun, especially rising and setting with the sun.
adjective:  Of or relating to the rising of a star when it first becomes visible just before sunrise in the eastern sky, having previously been made invisible by sunlight, or the analogous situation of its setting just after sunset.

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