Толковый словарь английского языка Oxford English Reference - jumbo

n. & adj. colloq. --n. (pl. -os) 1 a large animal (esp. an elephant), person, or thing. 2 (in full jumbo jet) a large airliner with capacity for several hundred passengers. Usage Usu. applied specifically to the Boeing 747. --adj. 1 very large of its kind. 2 extra large (jumbo packet). Etymology: 19th c. (orig. of a person): orig. unkn.: popularized as the name of a zoo elephant sold in 1882