"febrile epidemic disease of the tropics," 1828, from West Indian Spanish dengue, from an African source, perhaps Swahili dinga "seizure, cramp," with form influenced by Spanish dengue "prudery" (perhaps because sufferers walk stiffly and erect due to the painful joints which characterize the disease). The disease is from East Africa and was introduced into the West Indies in 1827.
"a lagging of one of two related phenomenon behind the other" [Century Dictionary], 1881, from Greek hysteresis "a coming short, a deficiency," from hysteros "later, second, after," from PIE *ud-tero-, from root *ud- "up, out" (see out (adv.)). Earlier as a term in rhetoric.
c. 1300, "absence, want; shortage, deficiency," not found in Old English, of uncertain origin. Perhaps it is from an unrecorded Old English *lac, or else borrowed from Middle Dutch lak "deficiency, fault;" in either case probably from Proto-Germanic *lek- (source also of Old Frisian lek "disadvantage, damage," Old Norse lakr "lacking" (in quality), "deficient" (in weight)), from PIE *leg- (2) "to dribble, trickle" (see leak (v.)). Middle English also had lackless "without blame or fault."