English
foldscope
From fold + -scope.
Formed from fold + -scope
Proto-Indo-European *pel- ‘to fold’
Proto-Germanic *falþaną ‘to fold’
Proto-West Germanic *falþan ‘to fold’
Old English fealdan ‘to fold’
Middle English folden ‘to fold’
English fold
Today it means
noun A microscope or similar optical instrument made by origami-like folding of a single piece of card (plus one or more lenses)
Language periods are conventional ranges, not dates for this word.
Etymograph / foldscope