Today's new word--acidulous

Sure it has the word "acid" in it, but is that what it means? Yes. Sometimes that's a fooler. But it does mean "bitter, sour in taste," with the synonyms, acerbic, biting, piquant, pungent, sharp, tart, vinegarish, and vinegary. I saw it in a book notice in Books and Culture in this context,

In this week's podcast, Stan Guthrie and I discuss Janet Malcolm's Iphigenia in Forest Hills, an acidulous account of a sensational murder trial.