heliacal

/hɪˈlaɪ.ə.kəl/

古希腊语词根

‘of the sun’

后缀

-al: Of or pertaining to. Adjectival suffix appended to various words, often nouns, to produce an adjective form. Often added to words of Latin origin, but used with other words also. · Forming nouns, especially of verbal action.

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

1rareOf or relating to the Sun, especially rising and setting with the sun.
2Of 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.