mesogloea

The mesodermal intercellular substance, or ground-substance, of some animals, as sponges and other cœlenterates.

[capitalized] A genus of gelatinous seaweeds, typical of the Mesoglæaceæ, with olive-brown branching filiform fronds.

A thin gelatinous tissue separating the ectoderm and endoderm in certain cœlenterates.