boron Definition in Cambridge British English Dictionary
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Definition of "boron" - British English Dictionary

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boronnoun [U]

uk   /ˈbɔː.rɒn/  us   /ˈbɔːr.ɑːn/ (symbol B)
a hard, yellow-brown chemical element used in nuclear reactors to absorb neutrons and in various compounds that are important in manufacturing
(Definition of boron from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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