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Cilia, hairlike projections, often part of a fringe, that provide locomotion for 1-celled organisms, and move fluid within higher forms of life. Cilia protruding from the lining of the upper respiratory tract move to pass on dust, germs, and mucus.

See also: Protozoan.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Children's literature to Clumber spaniel