1 paroxysmal Pertaining to or marked by paroxysm; caused by paroxysms or convulsions of nature. 2  paroxysmal Specifically In geology: Relating to or produced by a violent convulsion of nature.
Inorganic lead compounds are Group 2A - Probably carcinogenic to humans. American Conference for Governmental Industrial Hygienists (ACGIH): A3 - Confirmed animal carcinogen. Teratogenicity / Embryotoxicity: DEVELOPMENTAL HAZARD. May harm the unborn child. Known to cause: learning disabilities, effects on behaviour.
1 Lead may cause permanent damage to your brain and nervous system; children under 6 are most at risk for lead exposure and related health problems.  Common sources of lead exposure include lead-based paint, lead-contaminated household dust, contaminated soil and drinking water that flows through lead pipes.