[1] : 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.
   1913 webster

   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.
         1913 webster

   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.
      1913 webster
see also:
martlet marten purple martin bee martin progne subis progne purpurea 
house martin window martin hirundo urbica chelidon urbica bank martin 
bank fairy bee martin sand martin 

[2] : WordNet (r) 2.0

progne subis
     n : large north american martin of which the male is blue-black
         syn: purple martin
see also:
purple martin 

Progne >> P Words
Progne, definition of term: Progne
progne_pag1.html