It's no use trying to butter me up, EF. It
will not influence my decision!
Entrelac seems like a valid suggestion, but I'm not convinced about
depair.
Interestingly, the only
dictionary definition I could find for
entrelac, from Random House, was
not the knitting meaning:
–noun Printing.
a decorative border of interlaced garlands and leaves.
And then, when looking for examples of this printing use, I found a slightly different definition on a
page about William Morris:
He was one of the first printers to use entrelac initials, i.e., decorated initials used at the beginning of chapters or sections of text in which the letter formed part of an interlaced design or tracery.
However, the vast majority of examples of
entrelac usage are concerned with the knitting technique, although Google Book Search also throws up some books on art and design topics.
So I think
entrelac qualifies for our list, as a rare word.
However,
depair seems too obscure. I couldn't find it in any dictionary, or even in specialist glossaries. Some websites about Bluetooth technologies do define
pairing, in the sense of establishing a link between two devices, but the derived word
depair seems to be rarely used. The form
de-pair seems to be slightly more common, mainly in technical forums where comments are posted along the lines of, "I de-paired and re-paired but the phone just sat there saying 'Processing'." (Pages using
despair in connection with Bluetooth seem far more common.)
In fact, while looking for examples, I came up with a link to your original post, EF. Which - apart from highlighting how long it's been between question and answer, that there's been time for the Google index to pick up the post - seems also to be an indication that the word is rarely used.