köken: Etymology tree Esperanto leki Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-tós Proto-Indo-European *-eh₂tos Proto-Italic *-ātos Latin -ātus Latin -atader. Occitan -adader. French -adebor. Esperanto -ad- Esperanto -o Esperanto -ado Esperanto lekado From leki (“to lick”) + -ado (“prolonged action”).