lymphatic tissue

NOUN
16 LETTERS · STARTS WITH L

lymphatic tissue is a valid 16-letter word worth 27 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
L1Y4M3P3H4A1T1I1C3T1I1S1S1U1E1
1 + 4 + 3 + 3 + 4 + 1 + 1 + 1 + 3 + 0 + 1 + 1 + 1 + 1 + 1 + 1 =27 PTS
DOUBLE WORD → 54TRIPLE WORD → 81
MEANING

What does lymphatic tissue mean?