Crossword Genius

Blood-typing letters (3)

Ross

I believe the answer is:

'blood-typing letters' is the definition.
(I've seen this in another clue)

This is the entire clue.

I've seen this clue in The New York Times, The Wall Street Journal and the King Feature Syndicate.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.