单词 pia-arachnoid 释义 pia-arachnoid, piarachnoid Anat.[f. pia1 + arachnoid.]The pia mater and the arachnoid, considered as one structure. Also attrib.1889Buck's Handbk. Med. Sc. VIII. 111 The presence on the ental surface of the piarachnoid of a pial f...