Ses′qui‐sul″phide (?), n. [Sesqui- + sulphide.] (Chem.) A sulphide, analogous to a sesquioxide, containing three atoms of sulphur to two of the other ingredient; — formerly called also sesquisulphuret; as, orpiment, As2S3 is arsenic sesquisulphide.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.