1. Plural of epithelium; the layer of cells covering the outer surface of the body or lining internal organs and body cavities.
Usage: Medical/anatomical term; Always plural in this form; singular is 'epithelium'

Examples

• The epithelia of the respiratory tract help filter and warm incoming air.
• Different epithelia line the stomach, intestines, and other digestive organs.
• Damaged epithelia can lead to increased susceptibility to infection.
• The study examined how various epithelia respond to environmental stress.
• Epithelial cells in the epithelia constantly regenerate to maintain their protective function.