Sesquisalt :: Sesquisalt (n.) A salt derived from a sesquioxide base, or made up on the proportions of a sesqui compound..
Sesquisulphide :: Sesquisulphide (n.) 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..