Definition of preoperative adjective from the Oxford Advanced American Dictionary

 

preoperative

 adjective
adjective
NAmE//priˈɑpərət̮ɪv//
 
, NAmE//priˈɑprət̮ɪv//
 
(also pre-op informal)[only before noun]
 
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connected with the period before a medical operation Please schedule a preoperative appointment seven days before surgery.
See the Oxford Advanced Learner's Dictionary entry: preoperative