Muhammad Ainul, a traditional dhunuri (cotton carder), at work; Howrah, West Bengal, India. Photograph: Biswarup Ganguly (2011), Wikimedia Commons

The process of untangling and cleaning raw plant or animal fibre to produce a continuous fibre suitable for spinning into yarn. From the Latin word carduus, meaning “thistle-like,” referring to the dried thistle flower heads that were used to clean raw fibre.