HCY may refer to: Homocysteine, an amino acid , a Cameroonian hospital Tsuen Wan Public Ho Chuen Yiu Memorial College, a Hong Kong secondary school Helios Airways, a Cypriot airline (1998–2006; ICAO:HCY)
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HCY may refer to: Homocysteine, an amino acid , a Cameroonian hospital Tsuen Wan Public Ho Chuen Yiu Memorial College, a Hong Kong secondary school Helios Airways, a Cypriot airline (1998–2006; ICAO:HCY)