subarachnoidWiktionary 原文构词拆分sub-前缀Under, beneath. · Subsidiary, secondary.+arachnoid词根/词干词源说明From sub- + arachnoid.释义（英文）形容词 Adjective(anatomy, relational) Located or occurring below the arachnoid mater, often specifically between the arachnoid membrane and the pia mater.名词 NounEllipsis of subarachnoid space.词族派生词（1）subarachnoid space