I'm not sure you're hallucinating. The dictionary I checked lists the printing and journalism terms separately. It's quite possible they have diverging etymologies, meaning both can be correct:

5. Print. a. a thick strip of type metal less than type-high. b. such a strip containing a type-high number or other character for temporary use. c. a line of type in one piece, as produced by a Linotype. 8. Journalism. a. a short phrase or title used to indicate the story content of a piece of copy. b. the line of type carrying this information.