Inner Ear Electrophysiology (IEE) is an application ontology created to describe electrophysiology and biophysical data collections of the anatomical entities and cells (e.g., outer hair cells) of the inner ear. The ontology is developed with The Ontology for Biomedical Investigations (OBI) and integrated subsets of multiple OBO ontologies, especially, PATO, FMA, CHEBI, and OBA.