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Engineering
The discipline, art, skill and profession of applying scientific knowledge and principles to the design and manufacturing of machines, structures, devices, systems, materials and processes.
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alpha-particle
Astronomy; General astronomy
1) Nucleus formed by the α-process (q.v.) (see even-even nuclei.) 2) Particle first discovered in radioactive α decay, and later identified as helium nuclei (two protons and two ...
actinium
Astronomy; General astronomy
soft, silvery-white, radioactive metal which glows in the dark