A grapefruit is a citrus fruit with sour to semi-sweet taste. It is a citrus hybrid, which is a result of accidental hybrid between two citrus species, which include pomelo and sweet orange. The grapefruit comprises 92% water making it one of the fruits with highest water content. https://www.zupyak.com/p/4494272/t/grapefruit-a-nutritious-citrus-fruit-rich-in-vitamins-and-nutrients