Cilia’ refers to minute hair-like structures that protrude from the surface of certain cells. They are capable of rhythmic waving or beating movements and serve various functions, including locomotion, feeding, and the movement of fluids over the cell surface. Cilia are found in many organisms, including protozoa, certain algae, and in the respiratory tracts of animals, where they help to clear mucus and debris. The term is the plural form of ‘cilium.’
