硫化りゅうか Noun Irregular Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb sulfuration;sulphuration
硫化水素りゅうかすいそ Noun English jmdict 1 noun (common) (futsuumeishi) hydrogen sulphide;hydrogen sulfide;sulphuretted hydrogen;sulfuretted hydrogen