Where does “pássaro” come from?

pássaro (Spanish) comes from Vulgar Latin passarum, from Latin passer, from Proto-Indo-European peth₂- — to spread out; to fly.

Ancestry of “pássaro”, step by step

StepLanguageWordMeaning
1Vulgar Latinpassarumgenitive feminine plural of passus
2Latinpassersparrow; turbot
3Proto-Indo-Europeanpeth₂-to spread out; to fly
Every word from Proto-Indo-European peth₂- →Every word from Latin passer →Every word from Vulgar Latin passarum →