時計とけい皿ざら

noun

watch glass

A shallow, circular concave glass dish used in chemistry labs for evaporating liquids, holding solids, or as a beaker cover.

• 実じっ験けんで時計とけい皿ざらを使つかって溶よう液えきを蒸じょう発はつさせた。

  In the experiment, we used a watch glass to evaporate the solution.