This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An enclosing membrane or layer of tissue.

n. Same as tunic.

n. One of the layers of the choroid coat of the eye.

n. Specifically, the membrane lining the bony labyrinth of the ear; the walls of the membranous labyrinth.

n. an enveloping or covering membrane or layer of body tissue

"The mesothelioma tissue surrounding the male internal reproductive organs is called the tunica vaginalis testis."

tissue layer    membrane   

tunica abdominalis    tunica vaginalis oculi    tunica ruyschiana    tunica cornea pellucida    tunica vasculosa testis    tunica arachnoidea    tunica adnata    tunica reflexa    tunica granulosa    tunica choriocapillaris   

albuginea   

undescended    matre    unquam    pellis    contralateral    vigore    Biloxi    blackjack    dubioque    terno