I Am Trying To Order Glasses Online As Well And The Rx That My Doctor Sent To Me Says: R -5.50 -25 X 83?

How do I read this? The clearly-contacts site is asking for the SPH which is -5.50 but then it is asking for the CYL which from what I understand is the astigmatism correction but it looks like my doctor is saying it is -25?? It only goes up to -3.75…..Then it also asks for a PD – is that the distance between my eyes??