Enter a clue or pattern or both:
The Clue
Of fraternities and sororities collectively (11 letter answer)
The Answer
PANHELLENIC
Tags
Notes
The answer PANHELLENIC is so rare that it appears less than once every 2500 puzzles.
Definition
PANHELLENIC as an adjective:
1. (Panhellenic, Pan-Hellenic) = of or relating to all the Greeks; "the Olympic Games were a Panhellenic celebration"