English
filmslide
film + slide
Proto-Indo-European *pél-mo- ‘membrane’
Proto-Germanic *filmīn- ‘thin skin, membrane’
Proto-West Germanic *filmīn-
Old English filmen ‘film, membrane, thin skin’
Middle English filme ‘film’
English film
Proto-Indo-European *h₃sleydʰ- ‘to slip, slide’
…
Proto-Germanic *slīdaną ‘to slide, to slip’
Proto-West Germanic *slīdan ‘to slide, to slip’
Old English slīdan ‘to slide’
Middle English sliden ‘to slide then fall’
English slide
Today it means
noun Synonym of slide (“transparent plate bearing an image to be projected”).
Language periods are conventional ranges, not dates for this word.
Etymograph / filmslide