Wherefore art thou, aberil?

[nablator]

In parenthesis, Voynich months as transcribed by You are not allowed to view links. Register or Login to view..

It looks like the only month name completely unaccounted for in the french language of the late 14th century is "iollet" with the i.

The "i" is not really a problem, but "u" instead of "o" is much more common.

Jung, Jullet on the French 1305 astrolabe found by Thomas Sauvaget: You are not allowed to view links. Register or Login to view.

Initial J is actually I, written like what looks like J to us: "j" was not much in use, as in Latin (except for the last "i" of a sequence of "i"), and i/y were more or less equivalent. You could find different spellings of the same word with "i" or "y" until the orthography was standardized centuries later.