Correct spelling for the English word "Circu" is [sˈɜːkuː], [sˈɜːkuː], [s_ˈɜː_k_uː] (IPA phonetic alphabet).
• See Circum.
• A Latin prefix signifying around, round about, &c.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.