Cracker (noun)

1. A thin, crisp, dry biscuit or cookie, often served with cheese or spread.
2. A small, thin, cylindrical piece of dried paste, often seasoned, that is typically eaten with cheese or spread.
3. A person who breaks open safes or security systems, also known as a safe-cracker or safecracker.

Origin:

The word cracker comes from the old english word "craecc" which means "crisp" and it first appeared in the english language in the 14th century.

Examples:

1. She offered me a cracker with cheese.
2. He was munching on crackers while reading the newspaper.
3. The cracker was a perfect accompaniment to the wine.
4. The criminal was a professional cracker who broke into banks and safes.
5. The company's software is designed to prevent crackers from gaining unauthorized access to the system.