organelle

https://doi.org/10.1351/goldbook.15953

Microstructure or separated compartment within a cell that has a specialized function.

Examples: Ribosome, peroxisome, lysosome, Golgi apparatus, mitochondrion, nucleolus, nucleus.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1276 [Terms] [Paper]