Where does “costra” come from?
costra (Spanish) comes from Latin crusta, from Proto-Italic *krustos, from Proto-Indo-European krustós, from Proto-Indo-European krews- — to form a crust, begin to freeze.
costra (Spanish): crust; scab; snot
Ancestry of “costra”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Latin | crusta | The hard surface of a body; rind, shell, crust,... |
| 2 | Proto-Italic | *krustos | — |
| 3 | Proto-Indo-European | krustós | hardened |
| 4 | Proto-Indo-European | krews- | to form a crust, begin to freeze |