Related Clues:

• 'He was,' in Latin
• 'QED' part
• The "E" of QED
• Middle proof word
• 'QED' center
• Quod-demonstrandum connector
• Bit of Q.E.D
• QED's "E"
• It was: Lat
• The "E" of 30-Down
• Form of the Latin 'sum'
• Was: Lat
• The "E" of 39-Across
• The "E" of Q.E.D
• The "E" of Q.E.D