Its absence from any of the other dictionaries suggests that the word may have been an ad-hoc creation for one of the allegorical personifications, possibly even as a misreading of a present participle.
(
1267; MS: c.1300
)
Ceo (=daughters of Envy) sunt [...] damesoyle Grundilante E sa compaine Mal Oreillante (var. (Y: s.xiii4/4) Oreillaunce; Orillaunce)3124 (var.)