There is “versed” in “She is well versed in Roman history.”
And then there’s “Versed,” which a medical friend told me yesterday, is known as the anesthesiologist’s friend. E.g., suppose someone wakes up during their abdominal surgery. Not a nice thing. However, a quick shot of Versed removes the memory, along with sending them back to sleep.
I knew of the possibility of Versed through philosophical thought experiments, but I experienced the use of it recently, as reported here.
The thought experiment: How do you know you weren’t awake for the whole awful operation but just paralyzed and then given a drug which removed the memory of it? It turns out this is technically possible.