In Paul Turner's Blog by Paul Turner

Q: Is there a fancy name for the heading you see at the top of the readings in the lectionary? Not the biblical citation, but the summary of the reading’s content. I train the readers in my parish, and I’d like to use the right word when I tell them not to read it out loud.
A: There’s a reference to them in the Introduction to the Lectionary for Mass, paragraph 106. They’re called “headings”. The Latin word, though, is titulus. And my English edition has a misprint. It refers to the “readings” of the “readings” instead of the “headings” of the “readings”.