Shellback Definition
 shĕlbăk 
    noun
  
 An old, experienced sailor.
 Webster's New World 
Anyone who has crossed the equator by ship.
 Webster's New World 
Other Word Forms of Shellback
Noun
Singular:
 shellbackPlural:
 shellbacksOrigin of Shellback
From the toughness of such a sailor
From American Heritage Dictionary of the English Language, 5th Edition
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