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2 definitions found
 for Physalia
From The Collaborative International Dictionary of English v.0.48 :

  Physalia \Phy*sa"li*a\, prop. n. [NL., fr. Gr. fysalli`s a
     bladder, fr. fy^sa a bellows.] (Zool.)
     A genus of large oceanic Siphonophora which includes the
     Portuguese man-of-war.
     [1913 Webster]
     Note: It has a large air sac, or float, with a sail-like
           crest on its upper side. Numerous zooids of different
           kinds are attached to the under side of the float. Some
           of the zooids have very long tentacles; some have a
           mouth and digest food; others produce gonophores. The
           American species ({Physalia arethusa) is brilliantly
           colored, the float being pink or purple, and bright
           blue; the zooids blue. It is noted for its virulent
           stinging powers, as well as for its beautiful colors,
           graceful motions, and its ability to sail to windward.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: Portuguese man-of-war [syn: Physalia, genus Physalia]

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