ISOHEL Meaning of ISOHEL in English [ 'ʌɪsə(ʊ)hɛl ]■ noun Meteorology a line on a map connecting points having the same duration of sunshine.Originearly 20th cent.: from iso- + Gk hēlios 'sun'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004