n. Antimoniureted hydrogen (SbH3), a colorless gas of disagreeable odor, poisonous if respired, and burning in the air with a bluish flame: it deposits metallic antimony in spots on a piece of cold porcelain pressed down upon the flame. The gas also deposits the metal by passage through a glass tube heated at one point.n. A general term for any compound of antimony with an electropositive or alkyl radical, as triethyl-stibine, Sb(C2H5)3.