(inorganic chemistry) An inorganic polymer, of empirical formula BPO₄, used as a phosphor and a source of dietary boron.

(inorganic chemistry) A white solid, of empirical formula B₂O₃, that is an inorganic polymer, and is used in making glass and enamel and for synthesizing other boron compounds.

(inorganic chemistry) A binary compound of boron and nitrogen, of empirical formula BN; exists in forms analogous to the allotropes of carbon, many of which are inorganic polymers.

(inorganic chemistry) Any compound of general formula RB(OH)₂.

(mathematics) A binary tree.

(inorganic chemistry) A binary compound of boron and arsenic, BAs, used as a semiconductor, sometimes alloyed with gallium arsenide.

(chemistry) a vertical series of elements in the periodic table that have three valence electrons; boron is a metalloid, while aluminium, gallium, indium and thallium are metals

(inorganic chemistry) The compound boron trioxide.

(inorganic chemistry) A binary compound of boron and fluorine, BF₃; it is a strong Lewis acid.

(inorganic chemistry) A binary compound of boron and carbon, B₄C, that is a very hard ceramic, and is used in tank armour, bulletproof vests etc.