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define_method 

        # Module.define_method

(from ruby core)
---
    define_method(symbol, method)     -> symbol
    define_method(symbol) { block }   -> symbol

---

Defines an instance method in the receiver. The *method* parameter can
be a `Proc`, a `Method` or an `UnboundMethod` object. If a block is
specified, it is used as the method body. If a block or the *method*
parameter has parameters, they're used as method parameters. This block
is evaluated using #instance_eval.

    class A
      def fred
        puts "In Fred"
      end
      def create_method(name, &block)
        self.class.define_method(name, &block)
      end
      define_method(:wilma) { puts "Charge it!" }
      define_method(:flint) {|name| puts "I'm #{name}!"}
    end
    class B < A
      define_method(:barney, instance_method(:fred))
    end
    a = B.new
    a.barney
    a.wilma
    a.flint('Dino')
    a.create_method(:betty) { p self }
    a.betty

*produces:*

    In Fred
    Charge it!
    I'm Dino!
    #<B:0x401b39e8>

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