Correct spelling for the English word "glumacious" is [ɡluːmˈe͡ɪʃəs], [ɡluːmˈeɪʃəs], [ɡ_l_uː_m_ˈeɪ_ʃ_ə_s] (IPA phonetic alphabet).
Resembling the dry scale-like glumes of grasses.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.