IPA: //ˌpoʊsttrəˈmætɪk//
KK: /pəʊsttrəˈmætɪk/
Relating to or occurring after an injury, especially a physical one.
After the accident, she experienced posttraumatic stress that affected her daily life.
Posttraumatic → It is formed from "post-" (meaning after) and "trauma" (from Greek "trauma", meaning wound or injury). The word "posttraumatic" refers to conditions or symptoms that occur after a wound or injury, particularly in a psychological context.
Think of 'after' ('post-') a 'wound' ('trauma') to remember that 'posttraumatic' refers to experiences or conditions that arise following an injury.