watch-glass

noun

1. a curved glass disc that covers the dial of a watch
2. a similarly shaped piece of glass used in laboratories for evaporating small samples of a solution, etc

Example Sentences

The fluid to be examined is simply placed in a watch-glass, the watch-glass resting on the microscope stand.

From Project Gutenberg

The precipitate is filtered off by means of a miniature filter, and then removed on to a watch-glass.

From Project Gutenberg

The watch-glass maker exercises a function distinct from any one of those we have hitherto been considering.

From Project Gutenberg

If the drop is large, place it face upward on the rubber mat, cover it with an inverted watch-glass, and allow it to dry.

From Project Gutenberg

Place the cover-slip, film uppermost, on the rubber mat, and cover it with an inverted watch-glass until dry.

From Project Gutenberg