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Definition of arachnoid. 1  1 : of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater. 2  2 : covered with or composed of soft loose hairs or fibers.
Define arachnologist. arachnologist synonyms, arachnologist pronunciation, arachnologist translation, English dictionary definition of arachnologist. n. The branch of zoology that deals with spiders and other arachnids. arâ²achÂ·noÂ·logâ²iÂ·cal adj. arâ²achÂ·nolâ²oÂ·gist n