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acid
'acid' - used as an adjective
1. harsh or corrosive in tone
a barrage of acid comments
2. being sour to the taste
3. having the characteristics of an acid
an acid reaction

'acid' - used as a noun
4. any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
5. street name for lysergic acid diethylamide
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Fact of the day
The name Aspirin was invented from "A" in acetyl chloride. The "spir" comes from spiraea ulmaria which is the plant that they got the salicylic acid from, and the "in" was used because back then it was popular to end the name of medicines with "in."