ferial
Concise Oxford English Dictionary © 2008 Oxford University Press:
ferial /ˈfɪərɪəl, ˈfɛ-/
▶adjective Christian Church denoting an ordinary weekday, as opposed to one appointed for a festival or fast.
– origin ME: from med. L. ferialis, from L. feria ‘holiday’ (in late L. ‘day of the week’).
'ferial' also found in these Oxford entries:

