NOUN (2)

1. cleansing agent consisting of soaps or detergents used for washing the hair;

2. the act of washing your hair with shampoo;


VERB (1)

1. use shampoo on (hair);

The Collaborative International Dictionary of English v.0.48:

Shampoo \Sham*poo"\, n.
   The act of shampooing.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shampoo \Sham*poo"\, v. t. [imp. & p. p. Shampooed; p. pr. &
   vb. n. Shampooing.] [Hind. ch[=a]mpn[=a] to press, to
   squeeze.] [Writing also champoo.]
   1. 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.
      [1913 Webster]

   2. 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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

shampoo
    n 1: cleansing agent consisting of soaps or detergents used for
         washing the hair
    2: the act of washing your hair with shampoo
    v 1: use shampoo on (hair)

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "shampoo":
   ablution, abstergent, baptize, bath, bathe, cathartic, cleaner,
   cleaning agent, cleaning out, cleaning solvent, cleanser,
   cleansing cream, cold cream, cream, dentifrice, depurant,
   detergent, diuretic, douche, douching, elution, elutriation,
   emetic, enema, flush, flush out, flushing, flushing out, gargle,
   holystone, irrigate, irrigation, lather, lathering, launder,
   lavabo, lavage, lavation, lave, laving, lotion, mop, mop up,
   mopping, mopping up, mouthwash, nauseant, pumice stone, purgative,
   purge, purifier, rinse, rinse out, rinsing, ritually immerse,
   scour, scouring, scrub, scrub up, scrubbing, scrubbing up, shower,
   sluice, sluice out, soap, soaping, solvent, sponge, sponging, swab,
   swabbing, synthetic detergent, syringe, toivel, tooth powder,
   toothpaste, tub, wash, wash out, wash up, washing, washing up,
   washout, washup, wiping up