QED

1. Quantum electrodynamics
2. Quod erat demonstrandum (Latin), which was to be demonstrated (or proved; also q.e.d.)

• jackbooting
• jackboots
• jack-by-the-hedge
• jack-by-the-hedges
• jack-crosstree
• jack-crosstrees
• jackdaw
• jackdaws
• jack donkey
• jack easy
• jacked
• jackeen
• Jackeen
• jackeens
• jackeroo
• jackerooed
• jackerooing
• jackeroos
• jacket
• jacketed
• jacketing
• jacket potato
• jacket potatoes
• jackets
• jackfish