Dromedary
2 of the 7 encyclopedias on this shelf carry an entry for Dromedary. Both are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
drum'e-da-ry, a kind of camel. The term is derived from a Greek word meaning a runner. Like our words race-horse and saddle-horse, it has a relative meaning and may be applied to any camel trained to carry riders with speed. More properly, however, the dromedary is a variety of the one-humped Arabian camel noted for lightness of build and fleetness of foot. A well bred dromedary will trot nine miles an hour for a day and a night without signs of distress and, in case of need, can carry a messenger six hundred miles in five days with no other refreshment than a few quarts of water from a leathern water-bag and a few pounds of cake made of barley meal and powdered dates. The natural gait of a dromedary is a swinging trot. Both feet on one side are moved at the same time, then the feet on the other side are swung forward, after the manner of a pacing horse. The jolt is less than that of an ordinary camel; but it is terribly rough, and can be endured only by a practiced rider. If forced from his untiring pace into a gallop, the dromedary is soon exhausted. Consult the opening chapters of Lew Wallace's Ben Hur for a picture of the "Wise Men of the East" traveling and camping with their dromedaries. See Camel
Collier's New Encyclopedia (1921)
a swift variety of the one-humped camel, bearing the same relation to it as race horse to cart horse. Its usual pace is a trot, which can be maintained often at the rate of nine miles an hour for many hours on a stretch. After running for 24 hours, when in good condition, the dromedary is refreshed with a frugal meal of barley and powdered dates, along with a little water or camel's milk, and is then ready for another day of it. Though now distinctive of north Africa, the dromedary seems to have been unknown to the ancient Egyptians. DRONE. See BEE. DROUTHEIM. See TRONDHJEM.