enophthalmos

noun
en·​oph·​thal·​mos | \ ˌen-ˌäf-ˈthal-məs, -ˌäp-, -ˌmäs How to pronounce enophthalmos (audio) \
variants: also enophthalmus \ -​məs How to pronounce enophthalmus (audio) \

Medical Definition of enophthalmos

: a sinking of the eyeball into the orbital cavity