corpuscle

/ˈkɔrpʌsəl/
noun
  1. A very small cell or particle in the body, especially a red or white blood cell.
    • The doctor checked the number of white corpuscles in the blood sample.
    • Red corpuscles carry oxygen from the lungs to the rest of the body.
    • A corpuscle is so tiny that you need a microscope to see it.
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