Rocket-sled
noun
1.
a sled propelled along a long track by rocket engines, for testing the effects of high rates of acceleration and deceleration.
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noun 1. an exposure of rock in a steep slope or cliff.
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noun 1. an exposure of rock in a steep slope or cliff.
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adjective 1. (of a person) having a stiff, expressionless face. 2. having a rocky surface. 3. Masonry. noting a stone or stonework the visible face of which is dressed with a hammer, with or without a chiseled draft at the edges; quarry-faced.