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arable
Araby
aracari
arachidonic acid
arachis oil
arachnid
arachniography
arachnodactyly
arachnoid
arachnology
arachnophobia
Arafura Sea
Aragón
aragonite
Aral Sea
Araldite
aralia
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arachnoid

a·rach·noid [ ə rák nòyd ]


noun  (plural a·rach·noids)
Definition:
 
1. anatomy membrane in spinal cord: the middle of the three membranes that envelop the brain and spinal cord

2. zoology 
Same as  arachnid




adjective 
Definition:
 
zoology like arachnid: resembling or related to an arachnid

[Mid-18th century. Via modern Latin< Greek arakhnoeidēs "like a spider's web" < arakhnē "spider's web"]
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