a: power or capacity to resist; especially: the inherent ability of an organism to resist harmful influences (as disease, toxic agents, or infection) b: the capacity of a species or strain of microorganism to survive exposure to a toxic agent (as a drug) formerly effective against it due to genetic mutation and selection for and accumulation of genes conferring protection from the agent especially as a result of overuse of the agent which selectively destroys individual microorganisms lacking the protective genes
a: the opposition offered by a body to the passage through it of a steady electric current b: opposition or impediment to the flow of a fluid (as blood or respiratory gases) through one or more passages—see vascular resistance
: a psychological defense mechanism wherein a psychoanalysis patient rejects, denies, or otherwise opposes therapeutic efforts by the analyst
Opposition that a material or electrical circuit offers to the flow of electric current. It is the property of a circuit that transforms electrical energy into heat energy as it opposes the flow of current. The resistance R, the electromotive force or voltage V, and the current I are related by Ohm's law. The resistance of an electrical conductor generally increases with increasing temperature and is utilized in devices such as lamps and heaters. The ohm () is the common unit of electrical resistance; one ohm is equal to one volt (seeelectromotive force) per ampere.