Where does “ερυθροκύανος” come from?

ερυθροκύανος (Greek) comes from Greek κυανός, from Ancient Greek κύανος, from Hittite kuwannan-, from Proto-Indo-European ḱwey- — to hiss, to whistle, to whisper; to shine, white,...

ερυθροκύανος (Greek): purple, mauve, reddish-blue

Definitions

purple, mauve, reddish-blue

Ancestry of “ερυθροκύανος”, step by step

ερυθροκύανος traces back through two separate lines of ancestry.

via Greek κυανός

Step	Language	Word	Meaning
1	Greek	κυανός	cyan or sky blue; the colour cyan
2	Ancient Greek	κύανος	blue
3	Hittite	kuwannan-	precious stone, copper, blue
4	Proto-Indo-European	ḱwey-	to hiss, to whistle, to whisper; to shine, white,...

via Greek ερυθρός

Step	Language	Word	Meaning
1	Greek	ερυθρός	red
2	Ancient Greek	ἐρυθρός	reddish, red
3	Proto-Hellenic	*erutʰrós	—

Every word from Proto-Indo-European ḱwey- →Every word from Hittite kuwannan- →Every word from Ancient Greek κύανος →