Correct spelling for the English word "Dahline" is [dˈɑːla͡ɪn], [dˈɑːlaɪn], [d_ˈɑː_l_aɪ_n] (IPA phonetic alphabet).
A substance resembling starch obtained from the root of the dahlia.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.