watch-glass

a curved glass disc that covers the dial of a watch

a similarly shaped piece of glass used in laboratories for evaporating small samples of a solution, etc

Words nearby watch-glass

I also left others in a watch-glass, which was placed under a bell-jar enclosing several ferns.

Parasites |T. Spencer Cobbold
The impression may be made on a window-pane, a watch-glass, or even an eye-glass, if nothing better is at hand.

Finger Prints |Francis Galton
"Get me my watch-glass from the work bench," said Gilbert, his hands trembling with expectation.

Poppea of the Post-Office |Mabel Osgood Wright
The precipitate, having been dried, is transferred to a watch-glass.

A Textbook of Assaying: For the Use of Those Connected with Mines. |Cornelius Beringer and John Jacob Beringer

The tube is then held over a watch-glass, or a slide, upon which the water and object will fall on removing the fore finger.

An Elementary Text-book of the Microscope |John William Griffith