As a noun letheon
is sulphuric ether used as an anaesthetic agent.
As a verb letheonize is
to subject to the influence of letheon.
letheon
English
Noun
(
-)
(medicine, archaic) sulphuric ether used as an anaesthetic agent.
(
Webster 1913)
letheonize
English
Verb
(
letheoniz)
(transitive, obsolete, rare) To subject to the influence of letheon.
(
Webster 1913)