Part of a glass ... or glasses (3)
I believe the answer is:
rim
(Other definitions for rim that I've seen before include "Edge, border" , "Upper or outer edge" , "An edge, canyon or cup" , "Circumference" , "Outer edge of a wheel" .)
I believe the answer is:
rim
(Other definitions for rim that I've seen before include "Edge, border" , "Upper or outer edge" , "An edge, canyon or cup" , "Circumference" , "Outer edge of a wheel" .)