köken: Either derived or related to fieltro, or from Medieval Latin filtrum, from Frankish *filtir, plural of *filt, from Proto-West Germanic *felt (“felt”).
aile: filtración, filtrar, filtro de aire, papel de filtro
köken: Borrowed from French filtre, from Medieval Latin filtrum, from Frankish *filtir, plural of *filt, from Proto-West Germanic *felt (“felt”), derived from Proto-Indo-European *peld- (“something beaten or compressed; felt”), derived from the root *pelh₂- (“to beat; to push”).
köken: Borrowed from Ancient Greek φῐ́λτρον (phĭ́ltron, “a love charm”), derived from φῐλέω (phĭléō, “to love; to kiss”) + -τρον (-tron, instrument noun suffix).