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Zvoc47 (Tunjukkan profil) 12 Mei 2016 23.28.01
I'm mystifying that it's because lav' is already used for washing, but I'm not sure if this is correct.
erinja (Tunjukkan profil) 13 Mei 2016 00.02.56
I think you've got it right. Some roots are changed somewhat from an international form in order to avoid confusion with another existing root, and lavo -> lafo would seem like an excellent candidate.
Another example is that "bankedo" means "banquet". Most languages have a T in the word, but in Esperanto it was likely changed to a D to avoid being confused with banketo (bank/et/o, small bank)
Another example is that "bankedo" means "banquet". Most languages have a T in the word, but in Esperanto it was likely changed to a D to avoid being confused with banketo (bank/et/o, small bank)
ilemo (Tunjukkan profil) 13 Mei 2016 13.50.05
It's the same with planet: "planedo" instead of "planeto" (because plan-et-o).