F66r question

[Anton]

After all, apparently a letter in a simple phrase had to be corrected

If it's a correction, and not obfuscation.

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About that "thorn". I doubt that it's a thorn, because its rather out of context geographically and by XV century thorn was being obsoleted as far as I know. Presently it's preserved only in Icelandic/Faroese. But regardless, a single letter suggests an abbreviation. What abbreviation that could be?

[Koen G]

Why would they obfuscate marginalia?

[-JKP-]

Depending on the style of script, that top letter also resembles "wynn", which was spelled in various ways, wynn, wyn, win, wen and was sometimes written similarly to thorn. Thorn leaned slightly more toward a y-shape. Wynn leaned slightly more toward a p-shape.

So, maybe the word "ven" on the next line relates to the character above it.

[Anton]

Why would they obfuscate marginalia?

I developed a possible explanation here: You are not allowed to view links. Register or Login to view.

[Koen G]

But we can still see the original letter underneath, what kind of obfuscation is that?

[-JKP-]

The lines on top of the "m" are quite strange. If it's changed into a "d", it's not a very good one. It's disconnected, too large, and poorly shaped.

Usually they scrape or remove with chemicals rather than over-writing. Over-writing wasn't common. Re-inking sometimes happened, but that was to replace faded ink, not to change the letters underneath.

I keep wondering if those lines were underneath and "mel" was written on top but it doesn't look that way. It looks like the darker lines are on top.

[Searcher]

Whatever the symbol written over the m is (to me it looks like an at - abbr.), it is the same symbol as that before the en
and does not look like a correction...

The upper stroke differs. Ok. We can assume that the reason is the edging. But we can't be sure whether it is correction or not because of the blot exactly in this symbol. 

Koen G. wrote:

Why would they obfuscate marginalia?

There could be many explanations, for example, I can imagine that the marginalia play role of hints or red herrings, or either.
I mean that the author or a group of authors made the marginalia to look like Latin, German, French, Italian, even English to hide the language of the text. Some words remind Greek. Possibly, the text is in quite another language, or maybe, one of the languages is the language of the main content, and, not excluded that it is multilingual. 
As I wrote, I think the original text of the You are not allowed to view links. Register or Login to view. marginalia is under the overlayed letters. Perhaps, the overlayed symbols also play some role. I think the top "p"-like letter is related not to the original text, but to the overlayed. We discussed somehow that it also looks like Greek "You are not allowed to view links. Register or Login to view.". Let's assume this γ imply Latin g, the right letter is o, the left and the bottom ones are d, reading clockwise we will get the word "godd" (god -Middle English).
So, it can be a rebus or just a deception.

[Anton]

But we can still see the original letter underneath, what kind of obfuscation is that?

Still we don't know what's the original reading. That especially if some letters were added.

[Helmut Winkler]

The mistake you are making is that you ignore the obvious 

The 66r  shows a person with some malady  in his lower regions who is to have a plaster from mel/Mehl made into a Mus
en = en-  or emplastrum, the thorn is the same  p we have on 116v, d  is likely a kind of nota - sign.

The question is, if there is a connection with the single Voynichese line.

I have posted this before

[-JKP-]

Wynn and thorn are very similar to p and y, so much so that modern readers often mistake them for p and y, but they are not the same.

There is only one unambiguous "p" on You are not allowed to view links. Register or Login to view. , the others are not so certain (they almost look like a flat-bottom v and some look like the stems are maybe erased, and maybe are "p" and maybe not).

So I grabbed the unambiguous "p" in "pox" and put it next to the character that resembles wynn or thorn so we have it in the thread for the record:

   

P.S. This is a "daggered" "p" in the word "pox" and it's not uncommon for the descender to sometimes trail off. To get the dagger effect, you have to move quickly and lift (it takes some practice) and if you don't get it exactly right, the point is either too blunt or the end of the tail is too light.