01 A prefix (also used adjectively) denoting the combination of constituents (especially electro-negative and electro-positive bodies) in the …
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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.(Chem.)