The citron (Citrus medica) historically cedrate is a large fragrant citrus fruit with a thick rind. It is said to resemble a huge rough lemon . It is one of the original citrus fruits from which all other citrus types developed through natural hybrid speciation or artificial hybridization.Though citron cultivars take on a wide variety of physical forms they are all closely related genetically. It is used in Asian cuisine traditional medicines perfume and religious rituals and offerings. Hybrids of citrons with other citrus are commercially more prominent notably lemons and many limes.