If I told you that the word ‘helicopter’ is a pairing of two separate words, you’d probably think ‘heli’ and ‘copter’. You’d be wrong, of course, as always. Think helix and pterodactyl.
1 a combining form meaning “spiral”; used with this meaning and as a combining form of helix in the formation of compound words.
1 a combining form meaning “one with wings” of the kind specified.