A nonmetallic trivalent element, atomic no. 5, atomic wt. 10.811; occurs as a hard crystalline mass or as a brown powder, and forms borates and boric acid. A nutritional need has been reported for pregnant women. [Pers. Burah]
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bo·ron 'bō(ə)r-.än, 'bȯ(ə)r- n a trivalent metalloid element found in nature only in combination and used in metallurgy and in composite structural materials symbol B see ELEMENT (table)
bo·ron·ic bȯr-'än-ik, bōr- adj
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bo·ron (B) (borґon) [L. borium] a nonmetallic element occurring in the form of crystals and as a powder. It is the base of borax and boric acid; atomic number 5, specific gravity 2.54, atomic weight 10.811. See also boron poisoning, under poisoning.Medical dictionary. 2011.