unit cell

noun Crystallography.
the simplest unit of a regular lattice.

Origin:
1935–40

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World English Dictionary
unit cell
 
n
crystallog the smallest group of atoms, ions, or molecules that is characteristic of a particular crystal lattice

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The unit cell arrangement of the atoms within a crystal system gives the structure.
They will design a unit cell from a cluster of geometric shapes and repeat this design to form a tessellation.
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