I am not sure if I already talked about this one here, but it is one of my favorites.
The word for pistacchio comes from greek pistakion, which in turn from persian pistag. The persian word also went through arabic as "al-fustuq" and reached Spain where it turned into "alfóncigo", while at the same time the greek pistakion through italian pistacchio turned into the word "pistache."
Thus, in spanish, there are two very different words for the same idea, and with the same etymological origin.
>>1771reminds me of the "ornithopters" in dune, which they only mention by name and never describe. But the name is enough for a reader to make a mental image of them.