HELIACAL


Meaning of HELIACAL in English

[ hɪ'lʌɪək(ə)l ]

■ adjective Astronomy denoting the first rising (or last setting) of a star or planet which occurs at the same time as the rising of the sun.

Origin

C17: via late L. from Gk hēliakos (from hēlios 'sun') + -al .

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.