Huygenian eyepiece

noun
Huy·​ge·​ni·​an eyepiece | \ ˌhī-ˈgē-nē-ən- How to pronounce Huygenian eyepiece (audio) , ˌhȯi- How to pronounce Huygenian eyepiece (audio) , -ˈgen-ē-\
variants: also Huygens eyepiece \ ˈhī-​gənz-​ How to pronounce Huygens eyepiece (audio) , ˈhȯi-​ How to pronounce Huygens eyepiece (audio) \

Medical Definition of Huygenian eyepiece

: a compound eyepiece used especially with achromatic objectives that consists of two plano-convex lenses separated by a diaphragm with the convex sides facing the objective

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