a cotton wool

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He soaked bits of cotton wool in essential oils and passed it under the noses of his patients. (BNC)

The traditional way to remove your make-up is with a make-up remover or lotion, followed by skin tonic or freshener on cotton wool. (BNC)

Her foremost fear was that she might lose her mind, for trying to think made her feel as if her head were filled with cotton wool. (BNC)

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