In my “Mishearings” posting yesteday, I quoted Oliver Sacks:
I carefully record these in a little red notebook labeled “PARACUSES” — aberrations in hearing, especially mishearings.
Readers on Facebook were unable to find a reference on the term paracuses and entertained the possibility that Sacks had just made it up. As it turns out, no, or at least not entirely. The beginning of understanding is that the term is plural; it’s Sacks’s learnèd plural of the Greek-derived technical term paracusis. And that we can find in dictionaries.