noun Download 🔗Share A spherical or ovoid organelle found in the cytoplasm of eukaryotic cells and containing genetic material separate from that of the host; it is responsible for the conversion of food to usable energy in the form of ATP. Examples : "The mitochondrion in each cell acts like a tiny power plant, converting the food we eat into energy that our body can use. " biology biochemistry organ organism physiology anatomy science Chat with AIVocabulary GamePractice Reading