Standard Lemma guide

heliacal

adj · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • US: /hɪˈlaɪ.ə.kəl/

1

adj

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Usage: rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

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.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adjective

Meaning 3

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

Definition source: Princeton WordNet 3.0

Examples

  • the heliacal rising of the Dog Star
  • the heliacal or Sothic year is determined by the heliacal rising of Sothis (the Egyptian name for the Dog Star)

Meaning relationships

Synonyms: heliac

Antonyms: none provided

History

Etymology

From Ancient Greek ἡλιακός (hēliakós, “of the sun”) + -al. Appears in English first in the 16th century.