from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. The mesodermal intercellular substance, or ground-substance, of some animals, as sponges and other cœlenterates.
  • n. [capitalized] A genus of gelatinous seaweeds, typical of the Mesoglæaceæ, with olive-brown branching filiform fronds.


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