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/hɪˈlaɪ.ə.kəl/ · adjective
(rare) Of or relating to the Sun, especially rising and setting with the sun..
Use heliacal when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Heliacal means (rare) Of or relating to the Sun, especially rising and setting with the sun..
Common synonyms include heliac.
The opposite depends on the specific sense.
Use heliacal where its definition matches the intended context.
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