the rising of a celestial object at approximately the same time as the rising of the sun
the date at which such a celestial object first becomes visible in the dawn sky
/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
[hee-lee-an-thin, -theen] /ˌhi liˈæn θɪn, -θin/ noun, Chemistry. 1. .
[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)
noun 1. (NZ) the sport of snowboarding on mountains or glaciers accessible only by helicopter or skiplane