pia-arachnoid

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adjective

pia-arach·​noid ˌpī-ə-ə-ˈrak-ˌnȯid, ˌpē- 

variants also pia-arachnoidal

-ə-ˌrak-ˈnȯid-ᵊl 

or piarachnoid

ˌpī-ə-ˈrak-  ˌpē- 

: of, relating to, or being the leptomeninges

pia-arachnoid

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noun

variants also piarachnoid

: leptomeninges