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+\ http://www.forth200x.org/defined.html
+\ adapted to non-counted strings
+
+: [defined] parse-name find-name dup if swap drop then ; immediate
+: [undefined] postpone [defined] 0= ; immediate
+
+\ ... and without postpone (Enoch, Feb-2013)
+\ : [defined] parse-name find-name if drop -1 else 0 then ; immediate
+\ : [undefined] parse-name find-name if drop 0 else -1 then ; immediate