English
filterplate
From filter + plate.
Proto-Indo-European *pel-
Proto-Germanic *fellą ‘skin, hide’
Proto-West Germanic *felt
Medieval Latin filtrum ‘felt’
Middle English filtre
English filter
Proto-Indo-European *pleth₂- ‘flat’
…
Vulgar Latin *plattus ‘flat’
Medieval Latin plata
Old French plate ‘a flat metal disk’
Middle English plate
English plate
Today it means
noun An array of filters, each of which typically uses flat filter papers
Language periods are conventional ranges, not dates for this word.
Etymograph / filterplate