[chef] using a definition in another recipe

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I searched the docs/wiki and this list but didn't find anything.  

I have created a definition in one recipe that i want to use in another 
recipe.
 Can this be done?  Or, how should I accomplish my goal - which is to have the
functionality of a definition available across multiple recipes?

If it makes a difference I am running via chef-solo.  And, to reference a
definition named foo in recipe bar, i have tried Bar::foo and bar::foo.  In
both cases i get an error message: "Original: (eval):1:in `method_missing':
uninitialized constant Chef::Resource::Bar"

thanks in advance!
rich