Lacking cotton; not containing or made of cotton.
Cotton + -less suffix (from Old English -leas meaning 'without'). The -less suffix is one of English's most productive suffixes for creating negative adjectives.
The -less suffix is incredibly productive—you can add it to almost any noun to mean 'without that thing,' which is why you can say 'fearless,' 'endless,' 'homeless,' or even invent new words like 'tipless' (a pen without a tip).
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