Mitochondrion - English meaning

noun

An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. it has a double membrane, the inner part being folded inwards to form layers (cristae).

Usage examples:

Chloroplasts are cell organelles comparable to the mitochondria of animal cells.

noun

In a cell, a long or round structure found in the cytoplasm (= substance surrounding the central part) that produces energy for the cell by changing food into a form it can use