WordReference Random House Learner's Dictionary of American English © 2017
bo•ron /ˈbɔrɑn/USA pronunciation   n. [uncountable]
  1. Chemistrya nonmetallic element occurring in nature only in combination, as in borax or boric acid, and used in alloys and nuclear reactors.

WordReference Random House Unabridged Dictionary of American English © 2017
bo•ron  (bôron, bōr-),USA pronunciation n. [Chem.]
  1. Chemistrya nonmetallic element occurring naturally only in combination, as in borax or boric acid, and obtained in either an amorphous or a crystalline form when reduced from its compounds. Symbol: B; at. wt.: 10.811;
    at. no.: 5.
bo•ron•ic  (bō ronik, bô-, bə-),USA pronunciation adj. 
  • bor(ax1) + (carb)on 1805–15


Collins Concise English Dictionary © HarperCollins Publishers::

boron /ˈbɔːrɒn/ n
  1. 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. The naturally occurring isotope boron-10 is used in nuclear control rods and neutron detection instruments. Symbol: B; atomic no: 5; atomic wt: 10.81; valency: 3; relative density: 2.34 (crystalline), 2.37 (amorphous); melting pt: 2092°C; boiling pt: 4002°C
Etymology: 19th Century: from bor( ax) + ( carb) on



'boron' also found in these entries:
Advertisements

Word of the day: joke | drape

Advertisements

Report an inappropriate ad.
Become a WordReference Supporter to view the site ad-free.