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boron A very hard almost colourless crystalline metalloid element that in impure form exists as a brown amorphous powder. It occurs principally in borax and is used in hardening steel ['bɔːrɒn, -ɑːn] n
environ.	boro
English thesaurus
Boron ['bɔːrɒn, -ɑːn] abbr.
abbr., scottish	B