The Collaborative International Dictionary of English v.0.48:

Dromedary \Drom"e*da*ry\ (dr[u^]m"[-e]*d[asl]*r[y^]), n.; pl.
   Dromedaries (-r[i^]z). [F. dromadaire, LL. dromedarius, fr.
   L. dromas (sc. camelus), fr. Gr. droma`s running, from
   dramei^n, used as aor. of tre`chein to run; cf. Skr. dram to
   run.] (Zool.)
   The Arabian camel (Camelus dromedarius), having one hump or
   protuberance on the back, in distinction from the Bactrian
   camel, which has two humps.
   [1913 Webster]

   Note: In Arabia and Egypt the name is restricted to the
         better breeds of this species of camel. See Deloul.
         Dromond

The Collaborative International Dictionary of English v.0.48:

camel \cam"el\ (k[a^]m"[e^]l), n. [OE. camel, chamel, OF. camel,
   chamel, F. chameau L. camelus, fr. Gr. ka`mhlos; of Semitic
   origin; cf. Heb. g[=a]m[=a]l, Ar. jamal. Cf. As. camel, fr.
   L. camelus.]
   1. (Zool.) A large ruminant used in Asia and Africa for
      carrying burdens and for riding. The camel is remarkable
      for its ability to go a long time without drinking. Its
      hoofs are small, and situated at the extremities of the
      toes, and the weight of the animal rests on the callous.
      The dromedary (Camelus dromedarius) has one hump on the
      back, while the Bactrian camel (Camelus Bactrianus) has
      two. The llama, alpaca, and vicu[~n]a, of South America,
      belong to a related genus (Auchenia).
      [1913 Webster]

   2. (Naut.) A water-tight structure (as a large box or boxes)
      used to assist a vessel in passing over a shoal or bar or
      in navigating shallow water. By admitting water, the camel
      or camels may be sunk and attached beneath or at the sides
      of a vessel, and when the water is pumped out the vessel
      is lifted.
      [1913 Webster]

   Camel bird (Zool.), the ostrich.

   Camel locust (Zool.), the mantis.

   Camel's thorn (Bot.), a low, leguminous shrub (Alhagi
      maurorum) of the Arabian desert, from which exudes a
      sweetish gum, which is one of the substances called manna.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Camelus dromedarius
    n 1: one-humped camel of the hot deserts of northern Africa and
         southwestern Asia [syn: Arabian camel, dromedary,
         Camelus dromedarius]