Refers to a deceptive scheme or ploy, often used in the phrase 術中にはまる (to fall into a trap).
I completely fell for his clever talk and walked right into his trap.
noun which may take the genitive case particle 'no'
intraoperative; during surgery
Medical term; used in clinical contexts to describe events or procedures occurring during a surgical operation.
The amount of bleeding during surgery was less than expected.
death during surgery; intra-operative death
術 (technique, art) + 中 (inside, during). The 'trick' sense likely derives from being caught 'inside' someone's scheme. The medical sense is a straightforward compound meaning 'during surgery'.