(computing, networking) A high-capacity switch usually at the core or backbone of a computer network, aggregating network traffic to the Internet or a WAN.

plural of core lane

(metalworking) A projecting piece on a pattern which forms, in the mould, an impression for holding in place or steadying a core.

plural of molecular core

a dense core found in molecular clouds which lead to the formation of stars

(electrical) Energy wasted by hysteresis or eddy currents in the core of an armature, transformer, etc.

plural of ice core

plural of core sample

A cylindrical section of a naturally occurring substance, typically obtained by drilling into the substance, for example sediment or rock, with a core drill.

A core sample removed from an ice sheet, most commonly from the polar ice caps of Antarctica, Greenland or from high mountain glaciers elsewhere, the properties of which can be used to reconstruct a climatic record of a given area.