| boron | | |
| n. (substance) | 1. atomic number 5, b, boron | a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder. |
| ~ chemical element, element | any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| ~ borax | an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent. |
| ~ kernite | a light soft mineral consisting of hydrated sodium borate in crystalline form; an important source of boron. |
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