köken: Etymology tree French équerre Proto-Indo-European *-keh₂der. Proto-Balto-Slavic *-kāˀ Proto-Slavic *-ъka Old Polish -ka Polish -ka Polish ekierka From French équerre + Polish -ka. By surface analysis, ekier + -ka.
köken: Etymology tree Esperanto angulo Proto-Indo-European *-trom Proto-Slavic *-dloder. Proto-Indo-European *-lósder.? Proto-Indo-European *-tromder.? Proto-Germanic *-ilazder. Esperanto -ilo Esperanto angulilo From angulo + -ilo.