Markovnikov rule

noun Mar·kov·ni·kov rule \märˈkȯvnəˌkȯf-\

Definition of Markovnikov rule

  1. :  a statement in chemistry: in the addition of compounds to olefins the negative portion of the compound added (as the bromine in hydrogen bromide) becomes attached to the least hydrogenated end of the carbon-carbon double bond (as in the addition of hydrogen bromide to propylene: CH3CH=CH2+HBr→CH3CHBrCH3)

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Origin and Etymology of markovnikov rule

after Vladimir V. Markovnikov †1904 Russian chemist

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a trip made at another's expense

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