English
in-fill
From in + fill.
Proto-Indo-European *h₁én ‘in’
Proto-Germanic *in
Proto-West Germanic *in
Old English in
Middle English in ‘inside’
English in
Proto-Indo-European *pleh₁- ‘to fill’
…
Proto-Germanic *fullijaną ‘to make full’
Proto-West Germanic *fullijan ‘to fill’
Old English fyllan ‘to fill’
Middle English fillen ‘to fill up’
English fill
Today it means
noun Any material used to occupy a void or hiatus
Language periods are conventional ranges, not dates for this word.
Etymograph / in-fill