ˌhīdrəˈzinēəm noun
( -s )
Etymology: International Scientific Vocabulary hydrazin e + -ium
: either of two cations derived from hydrazine ; especially : the univalent cation NH 2 NH 3 +
hydrazinium chloride NH 2 NH 3 Cl or hydrazine hydrochloride NH 2 NH 2 .HCl