Pyrosome

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pyrosome \Pyr"o*some\, n. [Pyro- + -some body.] (Zool.)
     Any compound ascidian of the genus {Pyrosoma}. The pyrosomes
     form large hollow cylinders, sometimes two or three feet
     long, which swim at the surface of the sea and are very
     phosphorescent.
     [1913 Webster]