pyrosome

Pyrosome

Pyr"o*some\, n. [Pyro- + -some body.] (Zo["o]l.) 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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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