pseudofaeces
/ˈs(j)uːdəʊˌfiːsiːz/(also pseudofeces) Zoology
noun
Treated as plural. In a mollusc: a mixture of mucus from the gills and particulate matter from the water that collects in the mantle cavity and is expelled without passing through the digestive system.
Origin
1930s; earliest use found in Quarterly Journal of Microscopical Science. From pseudo- + faeces.