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[hi-lahy-uh-kuh l] /hɪˈlaɪ ə kəl/

adjective, Astronomy.
pertaining to or occurring near the sun, especially applied to such risings and settings of a star as are most nearly coincident with those of the sun while yet visible.

“pertaining to the sun,” c.1600, with -al (1) and Greek heliakos “of the sun,” from helios “sun” (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; thus it also is known as the canicular year.


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  • Helianthemum

    /hiːlɪˈænθəməm/ noun 1. any plant of the dwarf evergreen genus Helianthemum, some species of which are grown as rock-garden plants for their numerous papery yellow or orange flowers; related to the rockrose, which they resemble: family Cistaceae Also called Cape primrose

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    [hee-lee-an-thin, -theen] /ˌhi liˈæn θɪn, -θin/ noun, Chemistry. 1. .

  • Helianthus

    [hee-lee-an-thuh s] /ˌhi liˈæn θəs/ noun, plural helianthuses. 1. any composite plant of the genus Helianthus, comprising the sunflowers. /ˌhiːlɪˈænθəs/ noun (pl) -thuses 1. any plant of the genus Helianthus, such as the sunflower and Jerusalem artichoke, typically having large yellow daisy-like flowers with yellow, brown, or purple centres: family Asteraceae (composites)

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