World English Dictionary
kerma (ˈkɜːmə)
physics the quotient of the sum of the initial kinetic energies of all the charged particles liberated by indirectly ionizing radiation in a volume element of a material divided by the mass of the volume element. The SI unit is the gray
[C20: k(inetic) e(nergy) r(eleased per unit) ma(ss)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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The kingdom of kerma arose as the first kingdom to unify much of the region.
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