köken: From Middle French flou, from Old French flou, flo (“soft, wilted, tired, exhausted”), from Old Frankish *hlāo (“lukewarm, tepid, mild”), from Proto-Germanic *hlēwaz (“warm, lukewarm”), from Proto-Indo-European *ḱlēw- (“to be warm or hot”). More at lew. Alternative etymology derives Old French flou, flo from Latin flāvus (“yellow”), via a farming metaphor.
köken: Etymology tree Proto-Indo-European *péh₂wr̥ Proto-Hellenic *pāwər Ancient Greek πῦρ (pûr) Proto-Indo-European *-rós Proto-Hellenic *-rós Ancient Greek -ρός (-rós) Ancient Greek πῠρρός (pŭrrhós)bor. Latin burrus Latin burra Old Spanish borra Spanish borra Proto-Italic *-āzi ▲ Latin -ereinflu. Latin -āre Old Spanish -ar Spanish -ar Spanish borrar Proto-Indo-European *h₃ed- Proto-Indo-European *-os…
aile: conjunto borroso, lógica borrosa, teoría de los subconjuntos borrosos
köken: From Old Occitan fosc, from Latin fuscus (compare Spanish hosco, Portuguese fosco, fusco, Italian fosco, Dalmatian fosc, Catalan fosc, Old French fusque).