13º Royal Arch of Enoch

A little webresearch (actually, I was wondering whether this Enoch might have anything to do with Enoch Root of Cryptonomicon and the Baroque Trilogy) led me to the word desuetude, meaning fallen into disuse. ["L. desuetudo, from desuescere, to grow out of use, disuse; de + suescere to become used or accustomed: cf. F. désuétude," according to ARTFL Project's Webster Dictionary, 1913 Edition]

Do you suppose this could be another example of the linguistic contraction that made "eleëmosynary" into "alms" ?