hə̇ˈlīəkəl, hēˈ-, heˈ- adjective
Etymology: Late Latin heliacos, heliacus (from Greek hēliakos, from hēlios sun) + English -al
: relating to or near the sun — used especially of the last setting of a star before and its first rising after invisibility due to conjunction with the sun
• he·li·a·cal·ly -īək(ə)lē adverb