Crossword Genius

Major blood lines (6)

Ross

I believe the answer is:

aortas

'major blood lines' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for aortas that I've seen before include "Large trunk arteries" , "vessels arrive" , "So a rat gets into great arteries" , "Main arterial vessels" , "Major arteries at left or hearts" .)

I've seen this clue in the Newsday and the L.A. Times Daily.
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