C550 TAXIING FOR DEP TO RWY 9L AT PBI IS OVERFLOWN BY SMA DEP FROM RWY 9R WHILE ON TXWY F.

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FERRY FLT FROM PBI TO APF. CE560XL WAS OVERFLOWN BY A SMALL TWIN BY 50 FT. TAXI CLRNC FROM SIGNATURE AT PBI: CE560XL TAXI TO RWY 9L; TXWY E; TXWY F; TXWY L HOLD SHORT OF RWY 9L. I REPEATED THE CLRNC AND I COMPLIED WITH IT. DURING THE TAXI ON TXWY F; I NOTICED A SMALL TWIN ENG ACFT TAKING OFF ON RWY 9R. THE ACFT HAD ALREADY ROTATED AND WAS AIRBORNE WITH GEAR RETRACTED. THE ACFT OVERFLOW US AT ABOUT 50 FT. AT THAT TIME MY COPLT; WHO WAS TAXIING THE ACFT; RADIOED THE GND CTLR TELLING HIM TO INFORM THE PLT OF THE SMALL TWIN NOT TO TURN SO SOON. THE GND CTLR REPLIED OK. MY COPLT WAS UNDER THE IMPRESSION THAT THE SMALL TWIN TOOK OFF FROM RWY 9L. I INFORMED HIM THAT THE ACFT TOOK OFF FROM RWY 9R. I REPEATED THE TAXI CLRNC TO MY COPLT AND ASKED HIM IF HE AGREED IF IT WAS CORRECT. HE REPLIED THAT IT WAS CORRECT TO HOLD SHORT OF RWY 9L. NO OTHER RADIO COMS REGARDING THE INCIDENT WERE DISCUSSED AFTER THAT. WHAT I BELIEVED HAPPENED IS THAT THE GND CTLR GAVE US AN INCORRECT TAXI CLRNC. HE MUST HAVE MEANT TO SAY HOLD SHORT OF RWY 9R VICE 9L. HOWEVER; I REPEATED AND COMPLIED WITH THE CLRNC HE HAD GIVEN US. THERE IS NO HOLD SHORT LINE FOR RWY 9R ON TXWY F WHILE TAXIING NW. THERE IS A HOLD SHORT LINE AFTER TXWY L IN THE OPPOSITE DIRECTION.