retinus

From rēte (“a net”) +‎ -īnus (“-ine”, adjectival suffix).

• (Classical) IPA^(key): /reːˈtiː.nus/, [reːˈt̪iːnʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /reˈti.nus/, [reˈt̪iːnus]

rētīnus (feminine rētīna, neuter rētīnum); first/second-declension adjective (Medieval Latin)

1. of or pertaining to a net; netlike
   • 12th century, Guillelmus abbas, De natura corporis et animae 180:

     Primum ei supponitur tunica retina, vel circumponitur, ideo sic appellata quia ex venis et arteriis in modum retis est composita.

     First, a net-like tunic is found below, namely placed around, called this way because it is composed of veins and arteries in the shape of a net.

First/second-declension adjective.

• rētīna (noun)