na ‧ palm /ˈneɪpɑːm $ -pɑːm, -pɑːlm/ BrE AmE noun [uncountable]
[ Date: 1900-2000 ; Origin: naphthene a chemical compound (19-21 centuries) (from naphtha ) + palmitate a chemical substance (19-21 centuries) (from French palme 'palm tree' ) ]
a substance made from petrol that was used in bombs by US forces to burn fields and villages during the Vietnam war