What does CHO stand for?

Carbohydrate

an organic compound present in the cells of all living organisms and a major organic nutrient for human beings; consists of carbon, hydrogen, and oxygen, and makes up sugar, starch, and cellulose. Or An organic compound with the general formula Cx(H2O)y. OR  A chemical compound made up of a chain or ring of carbon atoms to which hydrogen and oxygen atoms are attached in a defined ratio (2:1); includes simple sugars like glucose and complex sugars like chitin (the exoskeleton of crabs) OR A polyhydroxy aldehyde or ketone. OR A class of organic compounds including sugars and starches.