| arachnoidal | <anatomy> Pertaining to the arachnoid membrane; arachnoid. Source: Websters Dictionary (01 Mar 1998) |
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| arachnoidal granulations | Tufted prolongations of pia-arachnoid, composed of numerous arachnoid villi that penetrate dural venous sinuses and effect transfer of cerebrospinal fluid to the venous system. at advanced age these are more numerous and tend to calcify. Synonym: granulationes arachnoideales, arachnoidal granulations, pacchionian bodies, pacchionian corpuscles, pacchionian glands, pacchionian granulations. (05 Mar 2000) |
| arachnoidea | <zoology> Same as Arachnida. Source: Websters Dictionary (01 Mar 1998) |
| arachnoidea mater spinalis | That portion of the arachnoid which lies within the vertebral canal and surrounds the spinal cord and the vertebral portion of the subarachnoid space. It extends from the foramen magnum above to the S-2 vertebral level. Since the spinal cord ends at the L-2 vertebral level, a wide separation occurs between the arachnoid and pia mater, the lumbar cistern, filled with cerebrospinal fluid in which the cauda equina is suspended. Synonym: arachnoidea mater spinalis, spinal part of arachnoid. (05 Mar 2000) |
| arachnoiditis | <pathology> Inflammation of the arachnoid membrane and adjacent subarachnoid space. (27 Sep 1997) |
| arachnological | Of or pertaining to arachnology. Source: Websters Dictionary (01 Mar 1998) |
| arachnologist | One who is versed in, or studies, arachnology. Source: Websters Dictionary (01 Mar 1998) |
| arachnology | <study> The department of zoology which treats of spiders and other Arachnida. Origin: Gr. Spider. (04 Mar 1998) |
| arachnolysin | A haemolytic substance in the venom of certain spiders. (05 Mar 2000) |
| arachnophobia | <psychology> Morbid fear of spiders. Synonym: arachnophobia. Origin: G. Arachne, spider, + phobos, fear (05 Mar 2000) |