antiseptic drug
A substance used locally on humans and other animals to destroy harmful microorganisms or to inhibit their activity (cf. disinfectants, which destroy microorganisms found on non-living objects, and antibiotics, which can be transported through the lymphatic system to destroy bacteria within the body).
tracer
A role played by a foreign substance mixed with or attached to a given substance to enable the distribution or location of the latter to be determined subsequently.
electrophilic reagent
A reagent that forms a bond to its reaction partner (the nucleophile) by accepting both bonding electrons from that reaction partner.
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