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reactor core

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core

1  [kawr, kohr] noun, verb, cored, cor⋅ing.
–noun
1. the central part of a fleshy fruit, containing the seeds.
2. the central, innermost, or most essential part of anything.
3. 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.
4. (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.
5. the inside wood of a tree.
6. Anthropology. a lump of stone, as flint, from which prehistoric humans struck flakes in order to make tools. Compare flake tool.
7. Carpentry.
a. a thickness of wood forming a base for a veneer.
b. a wooden construction, as in a door, forming a backing for veneers.
8. Engineering. kern 2 .
9. Metallurgy.
a. a thickness of base metal beneath a cladding.
b. the softer interior of a piece of casehardened metal.
c. 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.
10. Geology. the central portion of the earth, having a radius of about 2100 mi. (3379 km) and believed to be composed mainly of iron and nickel in a molten state. Compare crust (def. 6), mantle (def. 3).
11. Also called reactor core. Physics. the region in a reactor that contains its fissionable material.
12. Also called magnetic core. Computers. 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.
13. Ropemaking. heart (def. 16).
14. 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).
–verb (used with object)
15. to remove the core of (fruit).
16. to cut from the central part.
17. to remove (a cylindrical sample) from the interior, as of the earth or a tree trunk: to core the ocean bottom.
18. to form a cavity in (a molded object) by placing a core, as of sand, in the mold before pouring.
Origin:
1275–1325; 1945–50 for def. 11; ME; orig. uncert.; perh. < OF cors body < L corpus

Related forms:
coreless, adjective

Synonyms:
2. essence, heart, gist, center.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To reactor core
reactor core  
n.  The central part of a nuclear reactor where atomic fission occurs.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Cultural Dictionary

core

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 American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Word Origin & History

core 
1398, probably from O.Fr. coeur "core of fruit, heart of lettuce," lit. "heart," from L. cor "heart," from PIE base *kerd- "heart" (see heart).
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: core
Pronunciation: 'kO(&)r, 'ko(&)r
Function: noun
: the central part of a body, mass, or part
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

core (kôr)
n.

  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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Science Dictionary
core   (kôr)  Pronunciation Key 

  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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