For me teal is greener than it's blue, while turquoise is bluer than it's green. I think the term that makes me imagine the true smack-in-the-middle colour is "aqua". ("Cyan" is a printer's word, and it would look odd if used to describe, say, the colour of some swimming-pool tiles.)

Cyan is not just “a printer’s word”, it is a very specific hue, hex code #00FFFF.