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alloy
alloy steel
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allude
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alluvial fan
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allotropy

al·lot·ro·py [ ə lóttrəpee ] or al·lot·ro·pism [ ə lóttrə pìzzəm ]


noun 
Definition:
 
occurrence of element in different forms: the existence of a chemical element in more than one form allotrope, each having different physical but the same chemical properties

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