Definitions
from The Century Dictionary.
- noun The only genus of fresh-water sponges, belonging to the group Fibrospongiæ.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.) A genus of siliceous sponges found in fresh water.
Etymologies
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Examples
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Both chemical and histological observations showed the abundant presence of starch in the green cells, and thus these planarians, and presumably also _Hydra spongilla_, etc., were proved to be truly "vegetating animals."
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