A tiny particle or cell in the body, especially a red or white blood cell.
From the diminutive form 'corpusculum' of Latin 'corpus' (body), meaning literally 'little body.' The word entered English in the 17th century as microscopy revealed blood cells and other microscopic structures.
Newton himself used 'corpuscle' to describe his theory that light consists of tiny particles—it's the same word scientists use for blood cells under a microscope, showing how one concept (tiny physical units) revolutionized both biology and physics!
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