κύανος
kýanos
“dark blue”
5 words in English grow from this root.
Anthocyanin
Natureἄνθοςánthos
“flower blue”
Cyan
Artκύανοςkýanos
“dark blue stone”
Cyanide
Scienceκύανοςkýanos
“the dark-blue substance”
Cyanosis
Medicineκυανόςkuanós
“a turning dark blue”
Kyanite
Earthκύανοςkýanos
“blue stone”