: a scleroprotein that is the chief constituent of flexible fibers found in certain sponge skeletons
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Horny sponges, also called modern keratose demosponges, have a skeleton with three dimensional branching made of a tough organic substance called spongin.
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Ashley Strickland, CNN, 28 July 2021
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Ashley Strickland, CNN, 28 July 2021
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“Spongin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spongin. Accessed 4 Apr. 2026.
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spongin
noun
spon·gin
ˈspən-jən 
: a protein that is the main element making up the flexible fibers in sponge skeletons
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