- soman, GD - a nerve agent easily absorbed into the body; a lethal cholinesterase inhibitor that is highly toxic when inhaled
--1 is a kind of organophosphate nerve agent
- gadolinium, Gd, atomic number 64 - a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
--2 is a kind of metallic element, metal
--2 is a substance of gadolinite, ytterbite; samarskite