a·rach·noid 
(ə-răknoid′)
(ə-răknoid′)adj.
1. Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain.
2. Of, relating to, or resembling arachnids.
3. Covered with or consisting of thin, soft, entangled hairs or fibers resembling those of a cobweb or spider's web.
n.
1. An arachnid.
2. Anatomy A delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.
[New Latin arachnoīdēs, from Greek arakhnoeidēs, cobweblike : arakhnē, spider + -oeidēs, -oid.]
- put-on
- put (one) in mind
- put one in mind
- put one's cards on the table
- put (oneself) out
- put oneself out
- put (one's) finger on
- put (one's) finger on
- put one's finger on
- put one's finger on
- put (one's) foot down
- put one's foot down
- put one's foot in mouth
- put (one's) foot in (one's) mouth
- put one's foot in one's mouth
- put one's house in order
- put one's money where mouth is
- put (one's) money where (one's) mouth is
- put one's money where one's mouth is
- put (one's) nose to the grindstone
- put one's nose to the grindstone
- put (one's) shoulder to the wheel
- put one's shoulder to the wheel
- Putonghua
- Pu tong hua