lacrimal gland

Rock flour.

Meltwater which appears cloudy because glacial flour (rock flour) is suspended in it.

(usually uncountable) opaque glass, especially the kind having a white shade / (countable) a drinking glass intended or currently used for milk

A type of opaque, translucent glass.

Glass in the form of flat sheets, made by floating molten glass on the surface of molten metal; currently the main method of producing window glass.

Glass containing lead oxide, used for its high refractive index (often in cut glass) or for its ability to block ionizing radiation.

objective (part of a microscope, telescope, etc.)

A variety of hard glass of fine quality, made in Bohemia. It is of variable composition, containing usually silica, lime, and potash, rarely soda, but no lead. It is often remarkable for beauty of colour.

(archaic) A mirror.