English
glideslope
Compound of glide + slope.
Proto-Indo-European *gʰleydʰ-
Proto-Germanic *glīdaną ‘to glide’
Proto-West Germanic *glīdan ‘to glide, slide’
Old English glīdan ‘to glide’
Middle English gliden ‘to glide’
English glide
Today it means
noun The portion of an instrument landing system which provides vertical guidance to an aircraft during an approach to landing.
Language periods are conventional ranges, not dates for this word.
Etymograph / glideslope