(informal, inorganic chemistry) An extended covalent bond found in boranes in which a hydrogen atom is shared by two boron atoms; a form of three-center two-electron bond.

(chemistry) Any of several forms of extended covalent bond, deficient in one electron, joining three atoms.

A bone resulting from the fusion of metacarpals or metatarsals in some artiodactyls. / The metacarpal of a horse. / The metatarsal of a horse.

plural of dog bone

(simile) Stubborn and tenacious; persistent; relentless; dogged.

(chemistry) A covalent atomic bond that is rotationally symmetric about its axis.

Alternative spelling of bone meal

Ground bones used as a slow-release fertilizer, especially for bulbs.

plural of mastoid bone

(idiomatic) To work especially hard, usually for an extended period.