point defect

noun Crystallography.

an imperfection in a crystal's lattice structure, either a missing atom or ion creating a vacancy in the lattice or an extra atom or ion between two normal lattice points creating an interstitial.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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World English Dictionary

point defect

—n
	an imperfection in a crystal, characterized by one unoccupied lattice position or one interstitial atom, molecule, or ion

Collins English Dictionary - Complete & Unabridged 10th Edition
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