lodoicea sechellarum

from The Collaborative International Dictionary of English v.0.48
Sea cocoa \Sea" co"coa\ (Bot.)
   A magnificent palm ({Lodoicea Sechellarum}) found only in the
   Seychelles Islands. The fruit is an immense two-lobed nut. It
   was found floating in the Indian Ocean before the tree was
   known, and called sea cocoanut, and double cocoanut.
   [1913 Webster]
    

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