Source : Webster's Revised Unabridged Dictionary (1913)

Capsule \Cap"sule\, n. [L. capsula a little box or chest, fr.
   capsa chest, case, fr. capere to take, contain: cf. F.
   capsule.]
   1. (Bot.) a dry fruit or pod which is made up of several
      parts or carpels, and opens to discharge the seeds, as,
      the capsule of the poppy, the flax, the lily, etc.

   2. (Chem.)
      (a) A small saucer of clay for roasting or melting samples
          of ores, etc.; a scorifier.
      (b) a small, shallow, evaporating dish, usually of
          porcelain.

   3. (Med.) A small cylindrical or spherical gelatinous
      envelope in which nauseous or acrid doses are inclosed to
      be swallowed.

   4. (Anat.) A membranous sac containing fluid, or investing an
      organ or joint; as, the capsule of the lens of the eye.
      Also, a capsulelike organ.

   5. A metallic seal or cover for closing a bottle.

   6. A small cup or shell, as of metal, for a percussion cap,
      cartridge, etc.

   {Atrabiliary capsule}. See under {Atrabiliary}.

   {Glisson's capsule}, a membranous envelope, entering the
      liver along with the portal vessels and insheathing the
      latter in their course through the organ.

   {Suprarenal capsule}, an organ of unknown function, above or
      in front of each kidney.

Source : WordNet®

capsule
     n 1: a small container
     2: a pill in the form of a small rounded gelatinous container
        with medicine inside
     3: a dry dehiscent seed vessel or the spore-containing
        structure of e.g. mosses
     4: a shortened version of a written work [syn: {condensation},
        {abridgement}, {abridgment}]
     5: a structure that encloses a body part
     6: a spacecraft designed to transport people and support human
        life in outer space [syn: {space capsule}]
     7: a pilot's seat in an airplane that can be forcibly ejected
        in the case of an emergency; then the pilot descends by
        parachute [syn: {ejection seat}, {ejector seat}]
     v 1: enclose in a capsule [syn: {capsulate}, {capsulize}, {capsulise}]
     2: put in a short or concise form; reduce in volume; "capsulize
        the news" [syn: {encapsulate}, {capsulize}, {capsulise}]