lamina pro·pri·a 
(prōprē-ə)
(prōprē-ə)n. pl. laminae pro·pri·ae (-prē-ē′)
A thin vascular layer of connective tissue beneath the epithelium of a mucous membrane.
[New Latin lāmina propria : Latin lāmina, lamina + Latin propria, feminine of proprius, proper.]