What does anaesthetic mean?
The definition of anaesthetic
An`æs*thet”ic, a. (Med.)

(a) Capable of rendering insensible; as, anæsthetic agents.
(b) Characterized by, or connected with, insensibility; as, an anæsthetic effect or operation.

An`æs*thet”ic, n. (Med.)
That which produces insensibility to pain, as chloroform, ether, etc.