(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.

(medicine) any pathological effect in animals and humans due to a deficiency of boron in the diet / any of a number of disorders in plants that grow on granite, or other places deficient in boron

(inorganic chemistry) A binary compound of boron and chlorine, BCl₃; it is used in metal refining.

(inorganic chemistry) A binary compound of boron and iodine, BI₃; it is a crystalline solid.

(inorganic chemistry) A binary compound of boron and bromine, BBr₃; it is a strong Lewis acid.

(physics) A stable isotope, ¹¹₅B, having five protons and six neutrons, that makes up about 80% of natural boron.

(physics) A stable isotope, ¹⁰₅B, having five protons and five neutrons, that makes up about 20% of natural boron; it is a good absorber of slow neutrons and is used as a radiation shield in Geiger counters

(chemistry) scandium

plural of boron tree

plural of boron group