Term Name:	ommatidium
Synonyms:	omatidia, omatidium
Definition:	The smallest morphological and functional unit of the compound eye that consists of a usually limited and often constant number of rhabdomeric photoreceptor cells, cornea-secreting epithelial cells, and interommatidial pigment cells, and may additionally contain crystalline cone cells.
Ontology:	Cell Ontology [UBERON:0000971]