A fuel derived from petroleum (or other oils) but heavier than gasoline/petrol. Used to power diesel engines which burn this fuel using the heat produced when air is compressed.
His next truck will be a diesel.
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(countable) A vehicle powered by a diesel engine.
1959, ''Steam's Finest Hour'', edited by David P. Morgan, Kalmbach Publishing Co., referring to Mexico's last new steam locomotives.
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(cycling, slang) A rider who has an even energy output, without bursts of speed.
Their next engine design will be a diesel.
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