1. (人体分泌的)黏液
Mucus is a thick liquid that is produced in some parts of your body, for example the inside of your nose.

1. protective secretion of the mucus membranes
in the gut it lubricates the passage of food and protects the epithelial cells
in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium

Synonym: mucous secretion