cloth or thread made from the white hair of the cotton plant.——朗文当代大辞典

a plant with white hairs on its seeds that are used for making cotton cloth and thread.——朗文当代大辞典

British English thread used for sewing.——朗文当代大辞典

American English cotton wool.——朗文当代大辞典

The white fibrous substance, soft and downy like wool, which clothes the seeds of the cotton-plant (Gossypium); used (more extensively than any other material) for making cloth and thread, and for various purposes in the arts.——牛津当代大辞典  @en