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The Collaborative International Dictionary
Subsesqui-

Subsesqui- \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.