mucus
/ˈmjuːkəs/noun
mass noun
1- a slimy substance, typically not miscible with water, secreted by the mucous membranes and glands of animals for lubrication, protection, etc（动物黏膜或腺体分泌作润滑或保护用的）黏液。
1.1
- a gummy substance found in plants; mucilage（植物的）黏液; 粘胶。
词源
mid 17th cent.: from Latin.