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steam whistle
I heard the sound of a steam whistle from afar.
drop (of liquid); droplet
He spilled a drop of coffee on the table.
long time no see, it's been a while
Long time no see, have you been well?
briefing (a short and concise summary of a situation)
Please be sure to attend tomorrow's briefing.
(telegraphy) straight key
He sent a message using a straight key.
(organic chemistry) an organic compound
The study of organic compounds is an important field in chemistry.
(inorganic chemistry) an inorganic compound
This inorganic compound plays an important role in chemical reactions.
(chemistry) a sandwich compound
Sandwich compounds are being studied in a branch of chemistry.
penny wise and pound foolish; you get what you pay for
He always buys cheap things, so in the end, it becomes 'penny wise and pound foolish'.
(chemistry) acidic oxide
Acidic oxides react with water to produce acids.
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