Correct spelling for the English word "crenature" is [kɹˈɛnət͡ʃə], [kɹˈɛnətʃə], [k_ɹ_ˈɛ_n_ə_tʃ_ə] (IPA phonetic alphabet).
In bot., a notch in a leaf or style.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.