Where does “espalda” come from?

espalda (Asturian) comes from Vulgar Latin spatla, from Latin spatula, from Latin spatha, from Ancient Greek σπάθη, from Proto-Indo-European sph₂-dʰ-.

espalda (Asturian): back

Definitions

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Ancestry of “espalda”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	spatla	—
2	Latin	spatula	a broad, flat piece; a little palm frond; a...
3	Latin	spatha	spatula, spattle; spatha; a long, two-edged,...
4	Ancient Greek	σπάθη	any broad blade, of wood or metal
5	Proto-Indo-European	sph₂-dʰ-	—

Every word from Proto-Indo-European sph₂-dʰ- →Every word from Ancient Greek σπάθη →Every word from Latin spatha →