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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World English Dictionary
point defect
 
n
an imperfection in a crystal, characterized by one unoccupied lattice position or one interstitial atom, molecule, or ion

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Example sentences
If a point defect exists, the symmetry is broken, and the parameter will be a larger positive value.
Point defect dynamics in two-dimensional colloidal crystals.
We review our understanding of the basic mechanisms active in such structures that can result in point defect generation.
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