adj. 1. not containing the element lead. [ WordNet 1.5 ]

2. specifically: Not containing a lead additive such as tetraethyllead or tetramethyllead; -- of gasoline; as, Most modern cars run on lead-free gasoline. Oposite of leaded.
Syn. -- nonleaded, unleaded. [ WordNet 1.5 ]

3. specifically: Not containing a pigment having lead as a component; -- of paints; as, lead-free paint should be used wherever children are exposed to the painted surface. [ PJC ]