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Mitochondrion

/ˌmaɪtəˈkɑːndriən/noun

The organelle inside a cell that produces most of its chemical energy.

The Greek roots

μίτος
mítos
thread of a warp
+
χόνδρος
khóndros
grain, granule

Literally: thread-grain

The story of the word

Carl Benda coined the word in 1898 for structures he could see but not explain: under his stain they looked like threads in some cells and like scattered grains in others, so he named both shapes at once. Nobody knew they made energy until the 1940s. The same χόνδρος, a grain or lump, gives cartilage its medical prefix in chondrocyte and chondritis.

How it travelled
Ancient Greek → scientific coinage → English

Same family

mitosischondrocytechondritis

In a sentence

Muscle cells are crowded with mitochondria because they burn energy so fast.

Built on the same root

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