burn·up

[burn-uhp]
noun
the nuclear fuel consumed in a reactor, often measured as a percentage of the atoms of fuel that have undergone fission.

Origin:
noun use of the verb phrase burn up

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
burnup

noun
1. a high-speed motorcycle race on a public road 
2. the amount of fuel used up (as in a nuclear reactor) 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Burnup is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Example sentences
Fuel provides head-room for additional power uprates and high burnup limits.
Surplus weapon-grade fissile materials can be profitably and irrevocably demilitarized by burnup in existing nuclear reactors.
The concept of taking credit for the reduction in reactivity due to fuel burnup is commonly referred to as burnup credit.
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