Circumvallate Definition
 sûrkəm-vălāt 
  circumvallated, circumvallating
  
    verb
  
 To surround with or as with a wall or trench.
 Webster's New World 
    adjective
  
 Surrounded by or as by a wall or trench.
 Webster's New World 
Surrounded by a ridge or raised, wall-like structure.
 American Heritage Medicine 
Origin of Circumvallate
Latin circumvallāre circumvallāt- circum- circum- vallum rampart with palisades (from vallus post, stake)
From American Heritage Dictionary of the English Language, 5th Edition
-  
From Latin circumvallare, from circum- + vallum ‘rampart’.
From Wiktionary
 
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