ascorbic acid
US /əˌskɔːr.bɪk ˈæs.ɪd/
UK /əˌskɔːr.bɪk ˈæs.ɪd/

1.
a vitamin found in citrus fruits and green vegetables, essential for the maintenance of connective tissue, and acting as an antioxidant. Deficiency causes scurvy.
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Citrus fruits are rich in ascorbic acid.
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Ascorbic acid is also known as Vitamin C.