adjective
Definition: A term used to describe a sound that is produced without vocal cord vibration, or something that lacks meaning or sense.
Example: The teacher explained that a surd is a voiceless sound in linguistics.
noun
Definition: A type of number that cannot be expressed as a simple fraction, often represented as a root symbol, like the square root of 2.
Example: The square root of 2 is a surd because it cannot be simplified to a whole number.