To scald is to burn someone's skin with hot water, often accidentally. When you scald yourself, you're often doing it on purpose.
Salamanders are a type of amphibian that lives in cold water. They are able to absorb water through their skin, so they are able to live in very cold environments.
A harpoon is a type of spear that is used to catch fish. It is usually made out of wood, but sometimes it is made out of metal.
To inactivate something is to turn it off or to stop it from working. When you inactivate the alarm on your watch, you stop it from ringing.
Alkaloids are a type of drug that is made from plants. Alkaloids are often very poisonous, and they can be very dangerous if they get into your system.
A neurotoxic substance is a substance that can damage your brain. Some neurotoxic substances are chemicals that are used in manufacturing, and others are found in the environment.
A neurotoxin is a type of poison that attacks the brain. Some neurotoxins can cause hallucinations and other symptoms that are very unpleasant.
To dine is to have a meal. When you dine out, you're usually eating in a restaurant.
To repurpose something is to use it for a different purpose. You can repurpose an old object into something new, or you can use a new object to replace an old one.