English
slideout
From slide + out.
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
Proto-Indo-European *úd ‘upwards, away’
Proto-Germanic *ūt ‘out’
Proto-West Germanic *ūt ‘out’
Old English ūt ‘out’
Middle English out
English out
Today it means
noun A section of a recreational vehicle that can be extended from the main body of the vehicle when parked to form a separate room.
Language periods are conventional ranges, not dates for this word.
Etymograph / slideout