Definition of prolong in English:

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Pronunciation: /prəˈlôNG/
(also prolongate /-ˈlôNGɡāt/ /-ˈläNG-/)


[with object]
1Extend the duration of: an idea that prolonged the life of the engine by many years
More example sentences
  • The addition of a vasoconstrictor, such as epinephrine, constricts blood vessels and reduces vascular uptake, which further prolongs the duration of the anesthetic.
  • The latter is known to be due to the fact that hypocalcemia prolongs the duration of phase two of the action potential of cardiac muscle.
  • Hypothermia impairs the metabolism of drugs, prolonging the duration of some pharmacologic effects.
lengthen, extend, draw out, drag out, protract, spin out, stretch out, string out, elongate;
carry on, continue, keep up, perpetuate
1.1 (usually be prolonged) rare Extend in spatial length: the line of his lips was prolonged in a short red scar



Pronunciation: /prəˌlôNGˈ(ɡ)āSH(ə)n/
Example sentences
  • Birth-related outcomes that were evaluated included estimated gestational age, length of prolongation, and delivery at term.
  • Health has become the over-riding contemporary virtue, and the measure of health care in rich countries has become, to a great extent, the simple prolongation of life.
  • The prognosis will be much improved if the reason for its continual exacerbation and consequent prolongation were removed.




Late Middle English: from Old French prolonguer, from late Latin prolongare, from pro- 'forward, onward' + longus 'long'.

Words that rhyme with prolong

along, belong, bong, chaise longue, Geelong, gong, Guangdong, Haiphong, Heilong, Hong Kong, Jong, King Kong, long, mah-jong, Mao Zedong, Mekong, nong, pong, sarong, Shillong, song, souchong, strong, thong, throng, tong, Vietcong, wrong

For editors and proofreaders

Syllabification: pro·long

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