English
fillable
From fill + -able.
A compound of fill + -able
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
adj able to be filled
Language periods are conventional ranges, not dates for this word.
Etymograph / fillable