The Collaborative International Dictionary of English v.0.48:

Lamp \Lamp\ (l[a^]mp), n. [F. lampe, L. lampas, -adis, fr. Gr.
   ?, ?, torch, fr. ? to give light, to shine. Cf. Lampad,
   Lantern.]
   1. A light-producing vessel, device, instrument or apparatus;
      formerly referring especially to a vessel with a wick used
      for the combustion of oil or other inflammable liquid, for
      the purpose of producing artificial light; also, a similar
      device using a gas as the combustible fuel; now referring
      mainly to an electric lamp. See sense [3].
      [1913 Webster +PJC]

   2. Figuratively, anything which enlightens intellectually or
      morally; anything regarded metaphorically a performing the
      uses of a lamp.
      [1913 Webster]

            Thy word is a lamp unto my feet, and a light unto my
            path.                                 --Ps. cxix.
                                                  105.
      [1913 Webster]

            Ages elapsed ere Homer's lamp appeared. --Cowper.
      [1913 Webster]

   3. (Elec.) A device or mechanism for producing light by
      electricity, usually having a glass bulb or tube
      containing the light-emitting element. Most lamps belong
      to one of two categories, the Incandescent lamp (See
      under Incandescent) or the fluorescent lamp. However,
      see also arc lamp, below.
      [1913 Webster +PJC]

   4. A device that emits radiant energy in the form of heat,
      infrared, or ultraviolet rays; as, a heat lamp.
      [PJC]

   Aeolipile lamp, a hollow ball of copper containing alcohol
      which is converted into vapor by a lamp beneath, so as to
      make a powerful blowpipe flame when the vapor is ignited.
      --Weale.

   Arc lamp (Elec.), a form of lamp in which the voltaic arc
      is used as the source of light.

   D["e]bereiner's lamp, an apparatus for the instantaneous
      production of a flame by the spontaneous ignition of a jet
      of hydrogen on being led over platinum sponge; -- named
      after the German chemist D["o]bereiner, who invented it.
      Called also philosopher's lamp.

   Flameless lamp, an aphlogistic lamp.

   Lamp burner, the part of a lamp where the wick is exposed
      and ignited. --Knight.

   Lamp fount, a reservoir for oil, in a lamp.

   Lamp jack. See 2d Jack, n., 4
      (l) &
      (n) .

   Lamp shade, a screen, as of paper, glass, or tin, for
      softening or obstructing the light of a lamp.

   Lamp shell (Zool.), any brachiopod shell of the genus
      Terebratula and allied genera. The name refers to the
      shape, which is like that of an antique lamp. See
      Terebratula.

   Safety lamp, a miner's lamp in which the flame is
      surrounded by fine wire gauze, preventing the kindling of
      dangerous explosive gases; -- called also, from Sir
      Humphry Davy the inventor, Davy lamp.

   To smell of the lamp, to bear marks of great study and
      labor, as a literary composition.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

lampshell \lampshell\, lamp shell \lamp shell\n.
   A mollusklike marine animal with bivalve shell having a pair
   of arms bearing tentacles for capturing food, found
   worldwide.

   Syn: brachiopod.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Terebratula \Ter`e*brat"u*la\, n.; pl. Terebratulae. [Nl.,
   dim. fr. terebratus, p. p., perforated.] (Zool.)
   A genus of brachiopods which includes many living and some
   fossil species. The larger valve has a perforated beak,
   through which projects a short peduncle for attachment.
   Called also lamp shell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lamp shell
    n 1: marine animal with bivalve shell having a pair of arms
         bearing tentacles for capturing food; found worldwide [syn:
         brachiopod, lamp shell, lampshell]