I recently noted that everybody I know over the age of 55 knows the term "ptomaine poisoning" and regards it as a very common term. Two weeks ago it was one of the answers to NPR's Sunday weekly puzzle. Yet no one I know under the age of 45 as even heard of the term and that includes two nurses and a physician. I find this to be rather strange.
P.S. When I checked the spelling "ptomaine" was flagged though it is spelled corectly.