Where does “korko” come from?

korko (Ido) comes from Esperanto Korko, 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 (Ido): cork

Definitions

cork

Ancestry of “korko”, step by step

Step	Language	Word	Meaning
1	Esperanto	Korko	cork bottle stopper
2	English	Cork	(County Cork)
3	Middle English	cork	oak bark, cork
4	Middle Dutch	curc	cork
5	Spanish	corcho	cork
6	Latin	cortex	The bark of a tree; the bark of a cork tree;...
7	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 →