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solid fuel

British  

noun

  1. a domestic or industrial fuel, such as coal or coke, that is a solid rather than an oil or gas

  2. Also called: solid propellant. a rocket fuel that is a solid rather than a liquid or a gas

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Satellite imagery last year showed Iran still lacked the mixers needed for solid fuel.

From The Wall Street Journal ● Sep. 18, 2026

Anchoring Subaru’s SUV lineup, the all-wheel drive, subcompact 2026 Subaru Crosstrek combines a go-anywhere attitude with solid fuel economy and adventurous flair.

From MarketWatch ● Nov. 26, 2025

Iran's defence ministry denied reports that the explosion was caused by the improper handling of a shipment of sodium perchlorate, a solid fuel used for ballistic missiles.

From BBC ● Apr. 29, 2025

During the first three minutes, three solid fuel rocket motors power the missile’s flight.

From Los Angeles Times ● Feb. 18, 2025

Well—briefly does it—it got out a couple of years ago that some of our rocketeers had bought a solid fuel formula from an Italian research outfit for the star probe project.

From Status Quo by Mack Reynolds

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