Definition of “soap” - Learner’s Dictionary

soap

noun us uk /səʊp/
FOR WASHING [ U ]

A2 a substance that you use for washing:

a bar of soap
soap powder

More examples

TELEVISION PROGRAMME [ C ] also soap opera

B1 a television programme about the lives of a group of people that is broadcast several times every week

(Definition of “soap” from the Cambridge Learner's Dictionary © Cambridge University Press)