pos·i·tro·ni·um 
(pŏz′ĭ-trōnē-əm)
(pŏz′ĭ-trōnē-əm)n.
A short-lived association of an electron and a positron bound together in a configuration resembling the hydrogen atom.
- water purslane
- water rat
- water-repellent
- water-resistant
- water right
- Waters
- water sapphire
- waterscape
- water scooter
- water scorpion
- watershed
- water shield
- watershield
- waterside
- water ski
- waterski
- water-ski
- water-skier
- waterskin
- water snake
- waters of hydration
- water softener
- water-soluble
- water spaniel
- watersports