- (medicine, archaic, rare) A clear liquid believed to be a component of a humour or other bodily fluid (esp. plasma and lymph)
- (uncountable) Natural latex rubber, especially non-vulcanized rubber, such as is used in making latex gloves, latex condoms, and latex clothing.
- An emulsion of rubber in water, used in adhesives and the like.
- The milky sap of several trees that coagulates on exposure to air; used to make rubber.