Where does “korko” come from?

korko (Esperanto) comes from English cork, from Middle English cork, from Middle Dutch curc, from Spanish corcho, from Latin cortex, from Proto-Indo-European *(s)kort-ek-s.

korko (Esperanto): cork

Definitions

cork

Ancestry of “korko”, step by step

Step	Language	Word	Meaning
1	English	cork	The bark of the cork oak, which is very light and...
2	Middle English	cork	oak bark, cork
3	Middle Dutch	curc	cork
4	Spanish	corcho	cork
5	Latin	cortex	The bark of a tree; the bark of a cork tree;...
6	Proto-Indo-European	*(s)kort-ek-s	—

Every word from Proto-Indo-European *(s)kort-ek-s →Every word from Latin cortex →Every word from Spanish corcho →