shampoo

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various liquid or cream preparations of soap or detergent used to wash the hair and scalp.
• noun Any of various cleaning agents for rugs, upholstery, or cars.
• noun The act or process of washing or cleaning with shampoo.
• transitive & intransitive verb To wash or undergo washing with shampoo.

from The Century Dictionary.

• noun The act or operation of shampooing, in either sense.
• To rub and percuss the whole surface of (the body), and at the same time to extend the limbs and rack the joints, in connection with a hot bath, for the purpose of restoring tone and vigor to the system; a practice introduced from the East. Such kneading and rubbing of the whole body is now commonly called massage. Also used figuratively.
• To lather, wash, and rub or brush (the head) thoroughly.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To press or knead the whole surface of the body of (a person), and at the same time to stretch the limbs and joints, in connection with the hot bath.
• transitive verb To wash throughly and rub the head of (a person), with the fingers, using either soap, or a soapy preparation, for the more thorough cleansing.
• noun The act of shampooing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A traditional Indian and Persian body massage given after pouring warm water over the body and rubbing it with extracts from herbs.
• noun A commercial liquid soap product for washing hair or other fibres/fibers, such as carpets.
• noun An instance of washing the hair or other fibres with shampoo.
• noun humorous, slang Champagne (wine).
• verb intransitive To wash one's own hair with shampoo.
• verb transitive To wash (i.e. the hair, carpet, etc.) with shampoo.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun cleansing agent consisting of soaps or detergents used for washing the hair
• noun the act of washing your hair with shampoo
• verb use shampoo on (hair)