köken: Borrowed from Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, “twenty”) + ἕδρα (hédra, “face of a geometrical solid”). By surface analysis, icosa- + -edro.
köken: Etymology tree Esperanto du Proto-Indo-European *déḱm̥ Proto-Hellenic *dékə Ancient Greek δέκα (déka)der. Proto-Indo-European *déḱm̥ Proto-Italic *dekəm Latin decemder. Esperanto dek Esperanto dudek Esperanto edro Esperanto dudekedro From dudek (“twenty”) + edro (“geometric face”).