mass noun
1- a liquid preparation containing soap for washing the hair洗发水：
he smelt clean, of soap and shampoo
他闻上去有香皂和洗发露的清香味
count noun an anti-dandruff shampoo.去头屑洗发露。
1.1
- a similar substance for cleaning a carpet, soft furnishings, or a car（洗地毯、软家具陈设或汽车的）洗涤剂。
1.2
- count noun an act of washing or cleaning something, especially the hair, with shampoo洗发; 洗涤：
a shampoo and set.
洗发和做发。
(shampoos, shampooed)with obj.
1- wash or clean (something, especially the hair) with shampoo用洗发露洗（发）; 用洗涤剂清洗：
Dolly was sitting in the bath shampooing her hair.
多莉坐在浴缸里洗发。
1.1
shampoo something in/out
wash something in or out of the hair using shampoo用洗发露洗入（或洗掉）：apply oil to wet hair, otherwise it will be difficult to shampoo it out.
将油涂在湿发上, 否则很难用洗发露洗掉。
词源
mid 18th cent. （in the sense 'massage (as part of a Turkish bath process)'）：from Hindi cāmapo! ' press!', imperative of cāmpnā.