IPA: /ˌsʌbˈdʊrəl/
KK: /sʌbˈdʊrəl/
Referring to a location that is beneath a protective membrane in the brain called the dura mater.
The doctor explained that the patient had a subdural hematoma that required immediate attention.
Subdural → It is formed from "sub-" (meaning under) and "durus" (meaning hard, tough). The word "subdural" refers to the space or layer located beneath the tough outer membrane of the brain or spinal cord.
Think of something that is located 'under' ('sub-') a 'hard' layer ('durus') — that's why subdural refers to the area beneath a tough membrane.