arachnoid adjective & noun. [ǝ'raknɔɪd] M18.
[mod. Latin arachnoides from Greek arakhnoeidēs like a cobweb, formed as ARACHNID: see -OID.]
A. adjective.
1. Anatomy. Designating or pertaining to a fine delicate membrane which is the middle of the three meninges enveloping the brain and spinal cord. M18.

2. Botany. Covered with or consisting of cobweblike hairs. E19.

3. Like an arachnid; arachnean. M19.
b. noun. Anatomy. The arachnoid membrane. E19.
pia-arachnoid: see PIA noun¹.

■ arach'nitis noun = arachnoiditis E19.

■ arach'noidal adjective = ARACHNOID adjective 1 M19.

■ arachnoi'ditis noun inflammation of the arachnoid membrane M19.

[TahlilGaran] English Dictionary ▲