Usage Note
Interplanar is a technical adjective used chiefly in crystallography and materials science to describe distances or relationships between atomic planes in a crystal lattice (distancia interplanar, interplanar spacing). It is invariable by gender. Learners will encounter it mainly in scientific texts; it has no everyday colloquial use.
Examples
"La distancia interplanar varía según el material."
Natural Translation
The interplanar distance varies depending on the material.

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