1. Between two extremes; interposed; intervening. 2. A substance formed in the course of chemical reactions that then proceeds to participate rapidly in further reactions, so that at any given moment it is present in minute concentrations only; such substances, when appearing in the course of the reactions involved in metabolism, are metabolic i.'s. 3. In dentistry, a cement base. 4. An element or organ between right and left (or lateral and medial) structures.intermedius [NA] ;
replicative i. during the copying of the viral RNA of an RNA virus, the opposite sense strand that serves as a template for positive strand production.
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