General English

General Science


  • The central region of a star, planet or other body. In stars the core is the region where temperature and pressure are high enough to support fusion, containing half or more of its mass in a few per cent of the volume. The Earth’s core is a molten zone containing large amounts of iron, whose convection is the cause of the Earth’s magnetism, although there seems to be a small solid inner core at the very centre.


  • noun the central part, the heart of something

Cars & Driving

  • noun a central part which is entirely enclosed, as in an ignition coil, a sparking plug, an electrical lead or a tyre valve
  • noun the main part of a radiator below the header tank, consisting of numerous small tubes with cooling fins and gaps between for the air to pass through


  • noun the central conducting section of a cable


  • The interior structure of a hollow-core door.
  • A cylindrical sample of concrete or rock extracted by a core drill.
  • The void in a concrete masonry unit.
  • The center layer ofa sheet of plywood.
  • The vertical stack of service areas in a multistory building.
  • Metal support for a handrail.
  • The rubble filling in a thick masonry wall.
  • The center material between facing papers in gypsum wallboard.


  • The set of allocations that cannot be improved upon by a subset of consumers trading among themselves. In an pure exchange economy, the core is the contract curves.


  • A form around which a coil or winding is wound. For example, a ferromagnetic core.
  • A magnetic material, such as iron, around which a magnetic coil is wound. Such a core may be used in a device such as an electromagnet or transformer, and increases the inductance of the coil. Also called magnetic core (1).
  • The center conductor of a coaxial cable, or the bundled optical fibers encased by a protective sheath in a fiber-optic cable. Also called fiber core, or optical fiber core.


  • noun the central part of a fruit such as an apple or pear
  • noun
    (written as Core)
    the working name of the digestive Disorders Foundation, a charitable research body
  • verb to remove the core from something such as an apple or pear

Health Economics

  • (written as Core)
    The core of an economy (if one exists) is a state in which (1) no subset of members of the community can improve upon their position (as they see it) through trade or production and (2) which is also a Pareto optimum.

Origin & History of “core”

The origins of core are a mystery, over which etymologists disagree. several candidates have been put forward, including Old French cor ‘horn’, on the grounds that two of core’s earliest applications were to the horny central part of apples and pears and to corns on the foot, and Latin cor ‘heart’, on the grounds that an apple’s core is its ‘heart’.