boron

bo·ron   (bôr'ŏn', bōr'-)    n.   Symbol B A soft, brown, amorphous or crystalline nonmetallic element, extracted chiefly from kernite and borax and used in flares, propellant mixtures, nuclear reactor control elements, abrasives, and hard metallic alloys. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See Table at element. [bor(ax)1 + (carb)on.] bo·ron'ic (bə-rŏn'ĭk, bô-) adj.

boron 

Main Entry: bo·ron
Pronunciation: 'bO(&)r-"än, 'bo(&)r-
Function: noun
: a trivalent metalloid element found in nature only incombination and used in metallurgy and in composite structural materials —symbol B; —see ELEMENT table —bo·ron·ic /bor-'än-ik, bOr-/ adjective

boron bo·ron (bôr'ŏn')
n.
Symbol B
A soft, amorphous or crystalline nonmetallic element, used in flares and nuclear reactor control rods. Atomic number 5; atomic weight 10.811; melting point 2,075°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3.

boron   (bôr'ŏn')  Pronunciation Key  Symbol B A shiny, brittle, black metalloid element extracted chiefly from borax. It is a good electrical conductor at high temperatures and a poor conductor at low temperatures. Boron is necessary for the growth of land plants and is used in the preparation of soaps, abrasives, and hard alloys. It is also used in the control rods of nuclear reactors as a neutron absorber. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See Periodic Table.