Correct spelling for the English word "traindrous" is [tɹˈe͡ɪndɹəs], [tɹˈeɪndɹəs], [t_ɹ_ˈeɪ_n_d_ɹ_ə_s] (IPA phonetic alphabet).
In bot., having three distinct and equal stamens, as in the class.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.