English

heptalingual

From hepta- + lingual.

Proto-Indo-European *septḿ̥ ‘seven’

Proto-Hellenic *heptə́ ‘seven’

Ancient Greek ἑπτά ‘seven’

Proto-Indo-European *dn̥ǵʰwéh₂s ‘tongue’

Proto-Italic *dn̥ɣwā ‘tongue’

Latin dingua ‘pre-classical form of lingua’

Latin lingua ‘the tongue’

Latin linguālis

Today it means

adj speaking seven languages

Language periods are conventional ranges, not dates for this word.

Etymograph / heptalingual