WordReference Random House Learner's Dictionary of American English © 2015
con•di•tion•er /kənˈdɪʃənɚ/USA pronunciation  n. 
  1. a thick liquid applied to the hair to make it easier to comb, etc.: [uncountable]Apply conditioner after shampooing.[countable]conditioners for every type of hair.

WordReference Random House Unabridged Dictionary of American English © 2015
con•di•tion•er  (kən dishə nər), 
    1. a person or thing that conditions.
    1. something added to a substance to increase its usability, as a water softener.
    1. Clothinga cream or liquid preparation applied to the hair or skin, esp. for its emollient qualities.
    1. a trainer of athletes.
    1. an air conditioner.
    1. Textiles[Textiles.]a person who conditions fibers or fabrics.
  • condition + -er1 1590–1600

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