ultrahigh

[uhl-truh-hahy]
adjective
extremely high: ultrahigh skyscrapers of 100 stories.

Origin:
1945–50; ultra- + high

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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The biggest challenge of all, however, would be developing a flexible pipe that can withstand ultrahigh pressures.
Hobbyists used them to create robots, to fine-tune their car engines for ultrahigh mileage, and to build unmanned model airplanes.
Fiber optic links may soon help consumer gadgets and computers communicate with each other at ultrahigh speeds.
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