A vaccine is something that increases the body's immunity to a disease or condition like measles or the flu. Vaccines do not provide complete protection, but if enough people are vaccinated they can minimise outbreaks, or in some cases actually wipe out a disease.
Vis forVacuum cleaner
A vacuum cleaner, or sometimes a hoover, is a machine that is used to suck dirt and dust from floors inside your house. It works by making a vacuum inside it by pumping the air out of a chamber inside the cleaner, so that air from outside rushes in to fill up the space that is left. The dust is removed from the air by filtering it, usually through some cloth.
Someone is vain if they are overly interested in their own appearance, achievements or other things about themselves.
Vain is also another word for futile, as in "I tried in vain".
Scientific name: valeriana officinalis
Valerian is a hardy plant with pink or white flowers. The roots of the plant can be used for medicinal purposes, usually by making them into a tea. Valerian has a sedative effect and helps you to sleep.
You may also be interested in red valerian, an unrelated plant with a similar name.
Something is valuable if it is worth a lot of money. Some things are valuable for other reasons, for example they have sentimental value because they remind you of someone.
Vampires are a mythical creature which is said to exist by drinking people's blood. They are said to only come out at night as daylight can destroy them. It is also said they can only be killed by a stake through the heart, or by a silver bullet. A vampire has no reflection, so they cannot be seen in a mirror.
A van is a type of small truck that is used to carry small, covered loads around. Vans are often used by tradespeople like electricians and to deliver small furniture.