Synform Definition
    noun
  
 (geology) A topographic feature which is composed of sedimentary layers in a concave formation, but may not actually form a real syncline (i.e., the youngest rocks may not be exposed in the middle).
Wiktionary 
Other Word Forms of Synform
Noun
Singular:
 synformPlural:
 synformsOrigin of Synform
-  
syn- + form
From Wiktionary
 
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