What does ciliated mean?
Ciliated is an adjective describing any cell, tissue, or organism equipped with cilia — the dense carpet of microscopic, lash-like filaments that beat rhythmically across many living surfaces. In human anatomy, ciliated cells line the airways, the fallopian tubes, and parts of the brain, where their coordinated sweeping motion moves mucus, eggs, and cerebrospinal fluid. In microbiology, entire organisms such as paramecia are described as ciliated because they swim by rowing with thousands of these hairs. Botanists also use the term more loosely, applying it to leaves, seeds, and other plant parts edged with a fine fringe of hairs. The word descends from the Latin cilium, meaning eyelid or eyelash — the same root behind 'supercilious'. Precise and technical rather than conversational, ciliated is essential vocabulary in medicine, histology, and the life sciences.
adjectiveBearing or covered with fine hairlike structures called cilia, especially on the surface of a cell or organism; in botany, having a fringe of minute hairs along an edge.
- (of biological cells, tissues, or organisms) possessing cilia — microscopic hairlike organelles used for movement or moving fluids.
- (botany) having a marginal fringe of minute hairs, as on a leaf edge or seed.
"The ciliated epithelial cells lining the airways sweep mucus and trapped particles upward toward the throat."
"Paramecia are single-celled organisms that propel themselves through water by beating their ciliated surfaces."
"The seed's ciliated margin helps it catch the wind as it disperses from the parent plant."
The word 'ciliated' traces back to the same Latin root as your eyelashes — because under a microscope, cilia look exactly like tiny lashes waving on every cell.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ciliated
Ciliated derives from the Latin cilium, meaning 'eyelid' or 'eyelash', chosen by early microscopists because moving cilia resemble tiny lashes. It entered English scientific usage around the seventeenth century as microscopy revealed these structures, with the suffix -ate forming the adjective and -ion yielding the noun 'cilium'. The same Latin root gives us the English words 'cilia', 'ciliary', and, via the notion of raised eyebrows, 'supercilious'.
Related word forms
How ciliated is actually used
A technical term found chiefly in biology and botany writing; rare in everyday speech. In botanical contexts it often appears in species descriptions alongside terms like 'pubescent' and 'glabrous'. The adjectival form pairs with the noun 'ciliate' for organisms whose entire bodies are covered in cilia.
Easily confused with ciliated
'Ciliary' refers to things relating to the ciliary body of the eye or to cilia generally, while 'ciliated' describes something that actually bears cilia.