noun 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.
noun 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.
Webster English vocab. Английский словарь Webster. 2012