Is there a powershell to delete a Workflow from all the site collections?

Hello Everyone,


I was trying to find out right powershell for SharePoint 2013 environment. Is there a powershell to delete one Nintex workflow from all the site collections/lists under a "web application". I want this powershell to loop each  and every site collection and it should delete that Nintext workflow completely.  I was trying it for several days but no luck. Please provide your help. 

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