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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.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  solenoid(Noun) A coil of wire that acts as a magnet when an electric current flows through it. 2  solenoid(Noun) A mechanical switch consisting of such a coil containing a metal core whose movement is controlled by the current.