am·mo·ni·um 
(ə-mōnē-əm)
(ə-mōnē-əm)n.
The univalent chemical ion NH4+, derived from ammonia, whose compounds chemically resemble the alkali metals.
[AMMON(IA) + -IUM.]
- metacarpal
- metacarpally
- metacarpus
- metacenter
- metacentric
- metacentricity
- metachromatic
- metachromatism
- Metacom
- metadata
- metaethical
- metaethics
- metafiction
- metafictional
- metafictionist
- metagalaxy
- metagenesis
- metagenetic
- metagnathism
- metagnathous
- metal
- metalanguage
- metal detector
- metal halide lamp
- metalhead