Solid
A solid was one of the four fundamental states of matter. A dense state resistant to deformation, this condition exists in various forms of both matter and antimatter.

The Kataans used the solid propellant crystalline emiristol to fuel their Kataan probe. ()

The mellitus, a cloud creature from Alpha Majoris I, had a natural state that was gaseous, but when it was at rest, it was solid. ()

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Physics