‖ [ L., one half more, one and a half. ] (Chem.) A combining form (also used adjectively) denoting that three atoms or equivalents of the substance to the name of which it is prefixed are combined with two of some other element or radical;
☞ Sesquidupli- is sometimes, but rarely, used in the same manner to denote the proportions of two and a half to one, or rather of five to two. [ 1913 Webster ]
a. Sesquialteral. [ 1913 Webster ]
Sesquialteral ratio (Math.),
a. Sesquialteral. [ 1913 Webster ]
a. [ Sesqui- + basic. ] (Chem.) Containing, or acting as, a base in the proportions of a sesqui compound. [ 1913 Webster ]
a. [ Sesqui- + duplicate. ] Twice and a half as great (as another thing); having the ratio of two and a half to one. [ 1913 Webster ]
Sesquiduplicate ratio (Math.),
n. [ Sesqui- + oxide. ] (Chem.) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance;
[ 1913 Webster ]