vitamin C
US /ˈvaɪ.t̬ə.mɪn siː/
UK /ˈvaɪ.t̬ə.mɪn siː/

1.
a vitamin found in citrus fruits and green vegetables, important for healthy bones, skin, and blood vessels, and for fighting infections
:
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Oranges are a good source of vitamin C.
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She takes vitamin C supplements daily.