from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The chemical element (symbol B) with an atomic number of 5; a metalloid
from the GNU version of the Collaborative International Dictionary of English
- n. A nonmetallic element occurring abundantly in borax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic number 5. Atomic weight 10.81. Symbol B.
from The Century Dictionary and Cyclopedia
- n. Chemical symbol, B; atomic weight, 11. A chemical element belonging to the group of non-metals.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
bor(ax)1 + (carb)on.(American Heritage® Dictionary of the English Language, Fourth Edition)
From stem of borax + -on ("ending used to form names of substances") (Wiktionary)