The Collaborative International Dictionary of English v.0.48:

Antenna \An*ten"na\, n.; pl. Antenn[ae]. [L. antenna
   sail-yard; NL., a feeler, horn of an insect.]
   1. (Zool.) A movable, articulated organ of sensation,
      attached to the heads of insects and Crustacea. There are
      two in the former, and usually four in the latter. They
      are used as organs of touch, and in some species of
      Crustacea the cavity of the ear is situated near the basal
      joint. In insects, they are popularly called horns, and
      also feelers. The term in also applied to similar organs
      on the heads of other arthropods and of annelids.
      [1913 Webster]

   2. (Electronics) A metallic device, variously shaped,
      designed for the purpose of either transmitting or
      receiving radio waves, as for radio or television
      broadcasting, or for transmitting communication signals.
      Some types are: whip antenna, antenna tower, horn
      antenna, dish antenna, directional antenna and
      rabbit ears. See transmitter, receiver.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Dish \Dish\ (d[i^]sh), n. [AS. disc, L. discus dish, disc,
   quoit, fr. Gr. di`skos quoit, fr. dikei^n to throw. Cf.
   Dais, Desk, Disc, Discus.]
   1. A vessel, as a platter, a plate, a bowl, used for serving
      up food at the table.
      [1913 Webster]

            She brought forth butter in a lordly dish. --Judg.
                                                  v. 25.
      [1913 Webster]

   2. The food served in a dish; hence, any particular kind of
      food, especially prepared food; as, a cold dish; a warm
      dish; a delicious dish. "A dish fit for the gods." --Shak.

            Home-home dishes that drive one from home. --Hood.
      [1913 Webster]

   3. The state of being concave, or like a dish, or the degree
      of such concavity; as, the dish of a wheel.
      [1913 Webster]

   4. A hollow place, as in a field. --Ogilvie.
      [1913 Webster]

   5. (Mining)
      (a) A trough about 28 inches long, 4 deep, and 6 wide, in
          which ore is measured.
      (b) That portion of the produce of a mine which is paid to
          the land owner or proprietor.
          [1913 Webster]

   6. anything with a discoid and concave shape, like that of a
      dish.
      [PJC]

   7. an electronic device with a concave reflecting surface
      which focuses reflected radio waves to or from a point,
      used as a receiving or transmitting antenna; also called
      dish antenna. The dish is often shaped as a paraboloid
      so as to achieve a high sensitivity and enable reception
      of weak signals when used as a receiving antenna, or to
      focus transmitted signals into a narrow beam when used as
      a transmitting antenna.

   Syn: dish aerial, dish antenna, saucer. [PJC]

   8. a very attractive woman or young lady, especaially one
      sexually attractive; -- sometimes considered offensive and
      sexist; as, the departmental secretary is quite a dish.
      [slang]

   Syn: smasher, stunner, knockout, beauty, sweetheart, peach,
        lulu, looker, mantrap, dish. [WordNet 1.5 + PJC]

   9. a favorite activity, or an activity at which one excels.
      [slang]

   Syn: cup of tea, bag. [WordNet 1.5 + PJC]

   10. the quantity that a dish will hold, or a dish filled with
       some material.

   Syn: dishful. [WordNet 1.5 + PJC]

   satellite dish a dish antenna used to receive signals from
      or to transmit signals to a satellite which transmits or
      receives radio signals. In most common usage, it refers to
      small dish antennas used to receive television programs
      broadcast from geostationary satellites.
      [PJC]

WordNet (r) 3.0 (2006):

dish antenna
    n 1: directional antenna consisting of a parabolic reflector for
         microwave or radio frequency radiation [syn: dish, dish
         aerial, dish antenna, saucer]