Lime is a fruit tree, and the fruit itself. They are citrus fruits similar to lemons. Limes are rich in vitamin C. Sailors from Britain were given lemon or lime juice to stop them falling ill with scurvy. This is how they got the nickname Limey.
Limes are small, round and bright green. If they stay on the tree for a long time they turn yellow. Then they look like small round lemons.
Lime juice is used in cooking and in drinks. Lime oils are often used in perfumes, used for cleaning, and used for aromatherapy.
Lime tastes acidic and bitter. Lime juice is also made from limes.