phaeodium
/fiːˈəʊdɪəm/Zoology
noun
The dark mass surrounding the largest pore in the central capsule of a phaeodarian radiolarian, consisting of pigmented granules.
Origin
Late 19th century; earliest use found in Nature: a weekly journal of science. From scientific Latin phaeodium from ancient Greek ϕαιός grey + scientific Latin -odium.