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The gelatinous matrix within a sponge, filling the space between the external pinacoderm and the internal choanoderm.
Definition source: English Wiktionary via Wiktextract
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Meaning relationships
Synonyms: none provided
Antonyms: none provided
From meso- (“middle”) + Ancient Greek ὕλη (húlē, “wood, timber, matter”) (whence English hyle).