Englishfor English speakers
doctor
Noun
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A person who helps people who are sick, and looks after their health.
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A person who can work very well about a particular thing and is given the title Doctor by a university, for example a doctor in psychology could be called Doctor John Smith.
doctor
Verb
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If you doctor someone, you act as a medical doctor towards them.
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If you doctor something or someone, you change them.
of
Preposition
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Made using.
It is a house of cards.
commercial
Noun
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A commercial is an advertisement on TV or radio.
The actress recently appeared in a TV commercial for Meadowcup butter.
science
Noun
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The study of finding how things work. Some kinds of science are mathematics, biology, physics and chemistry.
is a kind of science.
science
Proper noun
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The sciences are the group of science subjects. These are mathematics, biology, physics and chemistry.