Sub‐ses″qui– (?). [Pref. sub- + sesqui-.] (Chem.) A prefix (also used adjectively) denoting the combination of constituents (especially electro-negative and electro-positive bodies) in the proportion of two to three; as, a subsesqui acetate, i.e., a salt having two equivalents of acetic acid to three of the base.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.