Macrocystis

1 definition found

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

  Macrocystis \Mac`ro*cys"tis\, n. [NL. See {Macro-}, and {Cyst}.]
     (Bot.)
     An immensely long blackish seaweed of the Pacific
     ({Macrocystis pyrifera}), having numerous almond-shaped air
     vessels.
     [1913 Webster]