Sugar sb. [ ME suker (XIIIc), sucre, sugre (XIVc), sugar (sugar from XVIc) - OFr. cukre, sukere (mod. sucre) - It. zucchero, prob. - med. L. succarum - Arab, sukkar ...] A sweet crystalline substance, white when pure, obtained from a great variety of plant juices, but chiefly from those of the sugar-cane and sugar-beet, and forming an important article of human food. Oxford English Dictionary.