Englishfor English speakers
abrasive
Adjective
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An abrasive substance, it is rough and can cut or scratch.
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If someone is abrasive, they are rude and unfriendly.
abrasive
Noun
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An abrasive is a rough substance used to clean a hard surface.
ultrasonic
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adjective
(= supersonic)
having frequencies above those of audible sound
tinning
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noun
the application of a thin layer of soft solder to the ends of wires before soldering them
careful tinning of the ends of wires results in a better joint when you solder them
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noun
the application of a protective layer of tin