inhalation anaesthetic

NOUN
22 LETTERS · STARTS WITH I

inhalation anaesthetic is a valid 22-letter word worth 29 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1N1H4A1L1A1T1I1O1N1A1N1A1E1S1T1H4E1T1I1C3
1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 3 =29 PTS
DOUBLE WORD → 58TRIPLE WORD → 87
MEANING

What does inhalation anaesthetic mean?