OMICRON

Xi-pi go-between

• 15th letter of the Greek alphabet

• A fraternity chapter

• Awfully moronic character from Greece (7)

• Certain fraternity chapter

• First letter given to Odysseus

• Greek character, possibly moronic when shaken up (7)

• Greek letter

• Greek vowel

• Hoi polloi character

• It comes before pi

• Letter from Greece

• O or O

• O, in the Greek alphabet

• Olympian's O

• Pi preceder

• Plato's o

• Xi follower

• The 15th letter of the Greek alphabet