Islamic scholars expertly gathered data and ordered it so that people could easily understand and reference information through various texts. They also summarized many Greek and Roman writings, compiling encyclopedias. Rather than being a subject in its own right, medicine was part of medieval Islamic culture.
A.D means in our time (Anno Domini, the year of our lord) and B.C means Before Christ - these two and the other mentioned words are used to B. refer to periods of time.
