Small grain-like or thread-like structures within cells, historically referring to structures now identified as mitochondria.
From Greek 'chondros' (grain) plus Latin diminutive '-ia'; used in early cell biology before modern electron microscopy provided clearer understanding of cellular organelles.
Scientists in the 1800s named structures based purely on appearance under light microscopes—'chondria' meant 'little grains,' and only decades later did we discover these were actually the cell's power plants.
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