English
Netherdutch
From nether- + Dutch, probably a calque of Dutch Nederduitsch (modern: Nederduits) or a calque of German Niederdeutsch.
Proto-Indo-European *niter ‘down’
Proto-Germanic *niþer ‘down, downwards’
Old English niþer ‘below, beneath, down, downwards, lower, in an…’
English nether-
Proto-Indo-European *tewtéh₂ ‘people’
Proto-Germanic *þiudiskaz ‘of one’s people’
Proto-West Germanic *þiudisk ‘of the people, popular, vernacular’
Middle Low German dütsch
Middle English Duch ‘German, Low German, Dutch’
English Dutch
Today it means
adj Dutch, pertaining to the Dutch language
Language periods are conventional ranges, not dates for this word.
Etymograph / Netherdutch