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It is not excluded that the word should be read as nublé (i.e. the p.p. of nubler used as an a. or s.); cf. DMF nublé and OED nubilé a.2. Even the word used in a rhyming position (see the S Brend mup citation) does not prove to be conclusive. However, the cognate references to the other dictionaries suggest that both forms nuble and nublé existed.