The Collaborative International Dictionary of English v.0.48:

Sweat \Sweat\, n. [Cf. OE. swot, AS. sw[=a]t. See Sweat, v.
   i.]
   1. (Physiol.) The fluid which is excreted from the skin of an
      animal; the fluid secreted by the sudoriferous glands; a
      transparent, colorless, acid liquid with a peculiar odor,
      containing some fatty acids and mineral matter;
      perspiration. See Perspiration.
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            In the sweat of thy face shalt thou eat bread.
                                                  --Gen. iii.
                                                  19.
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   2. The act of sweating; or the state of one who sweats;
      hence, labor; toil; drudgery. --Shak.
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   3. Moisture issuing from any substance; as, the sweat of hay
      or grain in a mow or stack. --Mortimer.
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   4. The sweating sickness. [Obs.] --Holinshed.
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   5. (Man.) A short run by a race horse in exercise.
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   Sweat box (Naut.), a small closet in which refractory men
      are confined.

   Sweat glands (Anat.), sudoriferous glands. See under
      Sudoriferous.