b. Of iodine, as iodine injection, iodine vapour; esp. in names of compounds, as iodine monochloride, ICl; iodine trichloride, ICl3; iodine pentoxide (iodic anhydride), I2O5.
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iodine1844
1844 G. FownesMan. Elem. Chem. 143 Hydriodic acid gas..is composed..of equal volumes of iodine vapour and hydrogen.
1873 H. WattsFownes's Man. Elem. Chem. (ed. 11) 194Iodine monochloride is a reddish-brown oily liquid.