capable of being extended or shaped by hammering or by pressure from rollers.
adaptable or tractable: the malleable mind of a child.

1350–1400; Middle English malliable < Medieval Latin malleābilis, equivalent to malle(āre) to hammer (derivative of Latin malleus hammer) + -ābilis -able

malleably, adverb
malleability, malleableness, noun
nonmalleable, adjective
unmalleable, adjective

2. impressionable, moldable, flexible, pliable.

2. refractory, intractable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
malleable (ˈmælɪəbəl)
1.  (esp of metal) able to be worked, hammered, or shaped under pressure or blows without breaking
2.  able to be influenced; pliable or tractable
[C14: via Old French from Medieval Latin malleābilis, from Latin malleus hammer]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from M.L. malleabilis, from malleare "to beat with a hammer," from L. malleus "hammer" (see mallet). Figurative sense, of persons, "capable of being adapted" first recorded 1610s. Related: Malleability.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

malleable mal·le·a·ble (māl'ē-ə-bəl)

  1. Capable of being shaped or formed, as by hammering or pressure.

  2. Easily controlled or influenced; tractable.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
malleable   (māl'ē-ə-bəl)  Pronunciation Key 
Capable of great deformation without breaking, when subject to compressive stress. Gold is the most malleable metal. Compare ductile.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Metals vary in this respect; pure gold is the most malleable.
And with its malleable shape, it could clean almost anywhere.
Passengers are much more malleable when they understand what's going on.
Yes, it is highly malleable and easy to shape.
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