bi-daily, bidaily or twice-daily? [closed]

I would like to say that a process happens two times a day, should I say:

• a twice-daily process
• a bi-daily process
• a bidaily process ?

Twice-daily is probably the best choice since it is unambiguous and commonly used. Using either bidaily or bi-daily risks the reader getting muddled between "twice a day" and "every other day".

Neither the Oxford or Cambridge online dictionaries list bidaily or bi-daily, possibly for the reason given above. Collins lists bi-daily as a "new word suggestion" (status: rejected).

Whilst not exactly neologisms, bidaily and bi-daily haven't gained any traction as the following Ngram shows:

If we add "twice a day" into the mix, we get a much clearer picture:

Google Books Ngram Viewer