From WordNet (r) 3.0 (2006) :
anesthetise
v 1: administer an anesthetic drug to; "The patient must be
anesthetized before the operation"; "anesthetize the gum
before extracting the teeth" [syn: anesthetize,
anaesthetize, anesthetise, anaesthetise, put under,
put out] [ant: bring around, bring back, bring
round, bring to]