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[kawr-ing, kohr-] /ˈkɔr ɪŋ, ˈkoʊr-/
the act of removing a core or of cutting from a central part.
Geology, Mining. core1 (def 4).
Origin of coring
First recorded in 1865-70; core1 + -ing1


[kawr, kohr] /kɔr, koʊr/
the central part of a fleshy fruit, containing the seeds.
the central, innermost, or most essential part of anything.
Also called magnetic core. Electricity. the piece of iron, bundle of iron wires, or other ferrous material forming the central or inner portion in an electromagnet, induction coil, transformer, or the like.
(in mining, geology, etc.) a cylindrical sample of earth, mineral, or rock extracted from the ground by means of a corer so that the strata are undisturbed in the sample.
the inside wood of a tree.
Anthropology. a lump of stone, as flint, from which prehistoric humans struck flakes in order to make tools.
Compare flake tool.
  1. a thickness of wood forming a base for a veneer.
  2. a wooden construction, as in a door, forming a backing for veneers.
Engineering. kern2 .
  1. a thickness of base metal beneath a cladding.
  2. the softer interior of a piece of casehardened metal.
  3. a specially formed refractory object inserted into a mold to produce cavities or depressions in the casting that cannot be readily formed on the pattern.
Geology. the central portion of the earth, having a radius of about 2100 miles (3379 km) and believed to be composed mainly of iron and nickel in a molten state.
Compare crust (def 6), mantle (def 3).
Also called reactor core. Physics. the region in a reactor that contains its fissionable material.
  1. Also called magnetic core. a small ring or loop of ferromagnetic material with two states of polarization that can be changed by changing the direction of the current applied in wires wound around the ring, used to store one bit of information or to perform switching or logical functions.
  2. Also called main memory, RAM. a term used to refer to main memory, though no longer made from from coils of ferromagnetic material.
Ropemaking. heart (def 16).
Phonetics. the final segment of a syllable beginning with the vowel and including any following consonants; the nucleus plus the coda.
Compare onset (def 3).
the muscles of the torso, which provide support for the spine and pelvis:
Building a strong core can help with posture and flexibility and can prevent back injury.
verb (used with object), cored, coring.
to remove the core of (fruit).
to cut from the central part.
to remove (a cylindrical sample) from the interior, as of the earth or a tree trunk:
to core the ocean bottom.
to form a cavity in (a molded object) by placing a core, as of sand, in the mold before pouring.
of central importance; basic; fundamental:
the core values of our organization.
noting or relating to the muscles of the torso:
core exercises for back pain.
1275-1325; 1945-50 for def 11; Middle English; origin uncertain; perhaps < Old French cors body < Latin corpus
Related forms
coreless, adjective
2. essence, heart, gist, center. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for coring
Historical Examples
  • Lettie went on with the paring and coring of her applesthen she took the raisins.

    The White Peacock D. H. (David Herbert) Lawrence
  • Prepare apples for pies by paring, coring, and dividing in eighths.

    Science in the Kitchen.

    Mrs. E. E. Kellogg
  • While the lasers were coring out the hole, six cargo cranes on their 400-ton carrier chassis had been moved into position.

    The Thirst Quenchers Rick Raphael
  • Just now she was peeling, quartering, and coring summer apples to dry for winter stores.

    The Graysons Edward Eggleston
  • Weigh six pounds of pineapple, after paring, coring, and cutting in rather small pieces.

  • Wash the apples; cut them in pieces without peeling or coring, but remove any imperfect parts.

    The Century Cook Book Mary Ronald
  • Take good sour apples, wash and wipe them, cut out any black spots upon the skin, and cut them up without paring or coring.

    The Young Housekeeper's Friend

    Mrs. (Mary Hooker) Cornelius
  • That lady was making preserves, for which Lucy had been kept since early morning paring and coring apples and stoning plums.

    Thankful Rest

    Annie S. Swan
  • With every "this" he had illustrated the virtues of his wares by slicing potatoes, coring apples, opening bottles and cans, etc.

  • Peel the oranges and the apples, cut them across in thin slices, coring the apples and removing the pips from the oranges.

British Dictionary definitions for coring


noun acronym (in the US)
Congress of Racial Equality


the central part of certain fleshy fruits, such as the apple or pear, consisting of the seeds and supporting parts
  1. the central, innermost, or most essential part of something: the core of the argument
  2. (as modifier): the core meaning
a piece of magnetic material, such as soft iron, placed inside the windings of an electromagnet or transformer to intensify and direct the magnetic field
(geology) the central part of the earth, beneath the mantle, consisting mainly of iron and nickel, which has an inner solid part surrounded by an outer liquid part
a cylindrical sample of rock, soil, etc, obtained by the use of a hollow drill
shaped body of material (in metal casting usually of sand) supported inside a mould to form a cavity of predetermined shape in the finished casting
(physics) the region of a nuclear reactor in which the reaction takes place
a layer of wood serving as a backing for a veneer
  1. one of several processing units working in parallel in a computer
  2. a ferrite ring formerly used in a computer memory to store one bit of information
  3. short for core store
  4. (as modifier): core memory
(archaeol) a lump of stone or flint from which flakes or blades have been removed
(physics) the nucleus together with all complete electron shells of an atom
(transitive) to remove the core from (fruit)
Derived Forms
coreless, adjective
Word Origin
C14: of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for coring



late 14c., probably from Old French coeur "core of fruit, heart of lettuce," literally "heart," from Latin cor "heart," from PIE root *kerd- "heart" (see heart). Nuclear reactor sense is from 1949.



mid-15c., from core (n.). Related: Cored; coring.

Online Etymology Dictionary, © 2010 Douglas Harper
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coring in Medicine

core (kôr)

  1. The central or innermost part.

  2. The part of a nuclear reactor where fission occurs.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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coring in Science
  1. The central or innermost portion of the Earth, lying below the mantle and probably consisting of iron and nickel. It is divided into a liquid outer core, which begins at a depth of 2,898 km (1,800 mi), and a solid inner core, which begins at a depth of 4,983 km (3,090 mi).

  2. A piece of magnetizable material, such as a rod of soft iron, that is placed inside an electrical coil or transformer to intensify and provide a path for the magnetic field produced by the current running through the wire windings.

  3. The central part of a nuclear reactor where atomic fission occurs. The core contains the fuel, the coolant, and the moderator.

  4. A long, cylindrical sample of soil, rock, or ice collected with a drill to study the strata of material that are not visible from the surface.

  5. A stone from which one or more flakes have been removed, serving as a tool in itself or as a source of flakes from which other tools could be fashioned. Stones used as cores include flint, chert, and obsidian. See more at core tool.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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coring in Culture

core definition

In geology, the central region of the Earth; it extends fourteen hundred to eighteen hundred miles from the Earth's center.

Note: The core is made primarily of iron and nickel and has two parts — an inner solid core and an outer liquid core.
Note: The mantle is the layer of the Earth that overlies the core.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang definitions & phrases for coring


Related Terms

hard-core, soft-core

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with coring


The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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