Where does “sanar” come from?

sanar (Spanish) comes from Old Spanish sanar, from Latin sānō, from Latin -ō, from Proto-Indo-European -ō — Derives nouns from roots.

sanar (Spanish): to cure; to heal

Definitions

Step	Language	Word	Meaning
1	Old Spanish	sanar	—
2	Latin	sānō	to heal, cure
3	Latin	-ō	suffixed to nouns or adjectives. Originally a-stem nouns. Later extended to nouns with other stems. Forms regular first-conjugation verbs
4	Proto-Indo-European	-ō	Derives nouns from roots