In Anglo-Norman the word is only attested in this document, and may be a misreading of the much more common overable¹. However, it is listed in DMF, with a single citation from Christine de Pizan’s writings, suggesting the form here might be genuine. Furthermore, its Medieval Latin counterpart operalis is well attested (also as dies operalis) – so much, in fact, that it is surprising that no other Anglo-Norman instances have (yet) been found.