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private_method_defined? 

        # Module.private_method_defined?

(from ruby core)
---
    mod.private_method_defined?(symbol, inherit=true)    -> true or false
    mod.private_method_defined?(string, inherit=true)    -> true or false

---

Returns `true` if the named private method is defined by *mod*.  If
*inherit* is set, the lookup will also search *mod*'s ancestors. String
arguments are converted to symbols.

    module A
      def method1()  end
    end
    class B
      private
      def method2()  end
    end
    class C < B
      include A
      def method3()  end
    end

    A.method_defined? :method1                   #=> true
    C.private_method_defined? "method1"          #=> false
    C.private_method_defined? "method2"          #=> true
    C.private_method_defined? "method2", true    #=> true
    C.private_method_defined? "method2", false   #=> false
    C.method_defined? "method2"                  #=> false

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.