artificial immunity

19 LETTERS · STARTS WITH A

artificial immunity is a valid 19-letter word worth 30 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

A1R1T1I1F4I1C3I1A1L1I1M3M3U1N1I1T1Y4

1 + 1 + 1 + 1 + 4 + 1 + 3 + 1 + 1 + 1 + 0 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 4 =30 PTS

DOUBLE WORD → 60TRIPLE WORD → 90

MEANING

What does artificial immunity mean?