2 [kyoo-bey]
any of several tropical plants of the legume family that are used in making fish poisons and insecticides.
Also, cubé [kyoo-bey] .

1920–25; origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cube1 (kjuːb)
1.  a solid having six plane square faces in which the angle between two adjacent sides is a right angle
2.  the product of three equal factors: the cube of 2 is 2 × 2 × 2 (usually written 2³)
3.  something in the form of a cube: a bath cube
4.  to raise (a number or quantity) to the third power
5.  (tr) to measure the cubic contents of
6.  (tr) to make, shape, or cut (something, esp food) into cubes
7.  (US), (Canadian) (tr) to tenderize (meat) by scoring into squares or by pounding with a device which has a surface of metal cubes
[C16: from Latin cubus die, cube, from Greek kubos]

cube2 (ˈkjuːbeɪ)
1.  any of various tropical American plants, esp any of the leguminous genus Lonchocarpus, the roots of which yield rotenone
2.  an extract from the roots of these plants: a fish poison and insecticide
[American Spanish cubé, of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1550s, from L. cubus, from Gk. kybos "a cube, a die, vertebra," from PIE base *keu(b)- "to bend, turn." The verb is 1580s in the mathematical sense; 1947 with meaning "cut in cubes."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cube   (kyb)  Pronunciation Key 
Verb   To multiply a number or a quantity by itself three times; raise to the third power. For example, five cubed is 5 × 5 × 5.

  1. The product that results when a number or quantity is cubed. For example, the cube of 5 is 125.

  2. A solid having six equal square faces or sides.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
There are theoretical arguments that the size of a legislature should
  proportional to the cube root of the number of voters.
Turbine power generation is proportional to the cube of wind speed.
Figure out the answers on every side of this crossword cube.
Cut and cube the mango for this salsa at home and then stash it in your cooler.
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