arachnoid
a
[[ModL arachnoides < Gr arachnoeidēs, like a cobweb < arachnē, spider (see arachnid) + -eidēs, -oid]]
1 Anat. designating the middle of three membranes covering the brain and the spinal cord: see dura mater, pia mater
2 Bot. covered with or consisting of soft, fine hairs or fibers
3 Zool. of or like an arachnid
—n.
1 Anat. the arachnoid membrane
2 Zool. an arachnid
