arterial blood vessel

NOUN
21 LETTERS · STARTS WITH A

arterial blood vessel is a valid 21-letter word worth 25 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1R1T1E1R1I1A1L1B3L1O1O1D2V4E1S1S1E1L1
1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 2 + 0 + 4 + 1 + 1 + 1 + 1 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does arterial blood vessel mean?