From arche and a compound of treis and klino (a dinner-bed, because composed of three couches); director of the entertainment -- governor (ruler) of the feast.
KJV: When the ruler of the feast had tasted the water that was made wine, and knew not whence it was: (but the servants which drew the water knew;) the governor of the feast called the bridegroom,
NASB: When the headwaiter tasted the water which had become wine, and did not know where it came from (but the servants who had drawn the water knew), the headwaiter called the bridegroom,