The Collaborative International Dictionary of English v.0.48:

Humor \Hu"mor\, n. [OE. humour, OF. humor, umor, F. humeur, L.
   humor, umor, moisture, fluid, fr. humere, umere, to be moist.
   See Humid.] [Written also humour.]
   1. Moisture, especially, the moisture or fluid of animal
      bodies, as the chyle, lymph, etc.; as, the humors of the
      eye, etc.
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   Note: The ancient physicians believed that there were four
         humors (the blood, phlegm, yellow bile or choler, and
         black bile or melancholy), on the relative proportion
         of which the temperament and health depended.
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   2. (Med.) A vitiated or morbid animal fluid, such as often
      causes an eruption on the skin. "A body full of humors."
      --Sir W. Temple.
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   3. State of mind, whether habitual or temporary (as formerly
      supposed to depend on the character or combination of the
      fluids of the body); disposition; temper; mood; as, good
      humor; ill humor.
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            Examine how your humor is inclined,
            And which the ruling passion of your mind.
                                                  --Roscommon.
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            A prince of a pleasant humor.         --Bacon.
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            I like not the humor of lying.        --Shak.
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   4. pl. Changing and uncertain states of mind; caprices;
      freaks; vagaries; whims.
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            Is my friend all perfection, all virtue and
            discretion? Has he not humors to be endured?
                                                  --South.
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   5. That quality of the imagination which gives to ideas an
      incongruous or fantastic turn, and tends to excite
      laughter or mirth by ludicrous images or representations;
      a playful fancy; facetiousness.
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            For thy sake I admit
            That a Scot may have humor, I'd almost said wit.
                                                  --Goldsmith.
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            A great deal of excellent humor was expended on the
            perplexities of mine host.            --W. Irving.
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   Aqueous humor, Crystalline humor or Crystalline lens,
   Vitreous humor. (Anat.) See Eye.

   Out of humor, dissatisfied; displeased; in an unpleasant
      frame of mind.

   Syn: Wit; satire; pleasantry; temper; disposition; mood;
        frame; whim; fancy; caprice. See Wit.
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The Collaborative International Dictionary of English v.0.48:

Vitreous \Vit"re*ous\, a. [L. vitreous, from vitrum glass;
   perhaps akin to videre to see (see Vision). Cf. Varnish.]
   1. Consisting of, or resembling, glass; glassy; as, vitreous
      rocks.
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   2. Of or pertaining to glass; derived from glass; as,
      vitreous electricity.
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   Vitreous body (Anat.), the vitreous humor. See the Note
      under Eye.

   Vitreous electricity (Elec.), the kind of electricity
      excited by rubbing glass with certain substances, as silk;
      positive electricity; -- opposed to resinous, or negative,
      electricity.

   Vitreous humor. (Anat.) See the Note under Eye.

   Vitreous sponge (Zool.), any one of numerous species of
      siliceous sponges having, often fibrous, glassy spicules
      which are normally six-rayed; a hexactinellid sponge. See
      Venus's basket, under Venus.
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WordNet (r) 3.0 (2006):

vitreous humor
    n 1: the clear colorless transparent jelly that fills the
         posterior chamber of the eyeball [syn: vitreous humor,
         vitreous humour, vitreous body]