subarachnoid
adjective medical specialized uk/ˌsʌb.əˈræk.nɔɪd/ us/ˌsʌb.əˈræk.nɔɪd/
蛛网膜下的
used to refer to the layer of tissue under the arachnoid membrane that covers the brain and spinal cord
a subarachnoid haemorrhage 蛛网膜下出血
a subarachnoid layer 蛛网膜下层