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watch glass
Definition
A watch glass is a small, round piece of glass with a slightly concave surface. It is used in science to hold small amounts of liquids or solids.
How can the word be used?
The watch glass was used to protect the slide from dust and dirt.
Different forms of the word
Noun: watch glass (plural: watch glasses).
Adjective: watch-glass.
Verb: to watch-glass.
Etymology
The word "watch glass" comes from the Old English word "wæcce", meaning "to watch", and "glæs", meaning "glass".
The first recorded use of the word "watch glass" was in the 17th century.
Question
When might a watch glass be used?