The Collaborative International Dictionary of English v.0.48:

Purple \Pur"ple\, a.
   1. Exhibiting or possessing the color called purple, much
      esteemed for its richness and beauty; of a deep red, or
      red and blue color; as, a purple robe.
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   2. Imperial; regal; -- so called from the color having been
      an emblem of imperial authority.
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            Hide in the dust thy purple pride.    --Shelley.
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   3. Blood-red; bloody.
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            May such purple tears be alway shed.  --Shak.
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            I view a field of blood,
            And Tiber rolling with a purple blood. --Dryden.
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   Purple bird (Zool.), the European purple gallinule. See
      under Gallinule.

   Purple copper ore. (Min.) See Bornite.

   Purple grackle (Zool.), the crow blackbird. See under
      Crow.

   Purple martin. See under Martin.

   Purple sandpiper. See under Sandpiper.

   Purple shell. See Ianthina.
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The Collaborative International Dictionary of English v.0.48:

Martin \Mar"tin\, n. [F. martin, from the proper name Martin.
   Cf. Martlet.] (Zool.)
   One of several species of swallows, usually having the tail
   less deeply forked than the tail of the common swallows.
   [Written also marten.]
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   Note: The American purple martin, or bee martin (Progne
         subis or Progne purpurea), and the European house
         martin, or window martin (Hirundo urbica or
         Chelidon urbica), are the best known species.
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   Bank martin.
   (a) The bank swallow. See under Bank.
   (b) The fairy martin. See under Fairy.

   Bee martin.
   (a) The purple martin.
   (b) The kingbird.

   Sand martin, the bank swallow.
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WordNet (r) 3.0 (2006):

purple martin
    n 1: large North American martin of which the male is blue-black
         [syn: purple martin, Progne subis]