collyrium
noun
col·lyr·i·um kə-ˈlir-ē-əm 
plural collyria kə-ˈlir-ē-ə or collyriums
or collyriums : eyewash sense 1
Word History
Etymology
Middle English collirium, from Latin collyrium, from Greek kollyrion pessary, eye salve, from diminutive of kollyra roll of bread
First Known Use
14th century, in the meaning defined above
Medical Definition
collyrium
noun
col·lyr·i·um kə-ˈlir-ē-əm
plural collyria -ē-ə or collyriums
or collyriums : an eye lotion : eyewash