Compound of 軟(なん)口(こう)蓋(がい) (nankōgai, “soft palate”) + 音(おん) (on, “sound”).
軟(なん)口(こう)蓋(がい)音(おん) • (nankōgaion)
軟口蓋音 • (yeon'gugaeeum) (hangeul 연구개음)