Is my password kept in the iPhone?

I access Bitwarden using my fingerprint on the iPhone. Does that mean that the iPhone now has access to my Bitwarden password?

Yes thanks. I actually read your post earlier but never got round to replying. (I blame global warming). Would I be correct in saying that to be absolutely sure my vault access is secure in case someone hacks into my phone or the Apple server is for me to use only the password?