watch glass
- noun
- /wɑtʃ ɡlæs/
- Specialized
:
vidrio de reloj
- After the initial heating, the watch glass was removed and the sample was evaporated at elevated temperature to approximately 10 mL.
Examples
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To prevent contamination, she covered the beaker with a watch glass during the experiment.
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Since the watch glasses were smaller in diameter than the wells, they fit easily.
Academic text (2001) -
Sensors were placed in each well between the tissue, and the corresponding watch glass was attached to the lid.
Academic text (2001) -
External pressure was applied by another identical watch glass to human skin mounted over the agar layer.
Academic text (2001) -
The skin was contacted from above by the convex face of an identical 2.5-cm-diameter watch glass.
Academic text (2001) -
The watch glass had a radius of curvature of 0.8 cm.
Academic text (2001) -
Agar was used to simulate the compliant tissue above the bone itself, simulated by a hard spherical section (watch glass).
Academic text (2001) -
The scientist placed a sample on the watch glass to allow it to evaporate slowly in the laboratory.
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He used a watch glass as an evaporating surface for the chemical solution he was testing.
How Big
Surface Forms
Morphology
watch + glass
The meaning 'a clear, protective cover over the face of a watch' is directly derivable from combining 'watch' (a timepiece) with 'glass' (a transparent material). This is a regular noun–noun compound following common compositional patterns (and similar formations exist in other languages), so a B1 learner who knows both constituents would readily infer the meaning.
Etymology
Watch glass may come from watchmakers who used a small round glass dish to hold tiny watch parts while they worked. That's why the name now means 'a shallow, round glass dish used in laboratories'.