A Zeppelin is a type of rigid airship originally designed by German Count Ferdinand von Zeppelin in the early 20th century. The Zeppelin design was so popular the name became used for all rigid airships.
The most famous Zeppelin was the Hindenburg, which crashed spectacularly in 1937.
Zest is the outside, coloured layer of citrus fruit like lemons and oranges. It is used to add flavour to many different kinds of food. Zest is removed from citrus fruit using a special tool called a zester, or just with a regular grater.