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spon·gin | \ ˈspən-jən 
\
\Definition of spongin
: a scleroprotein that is the chief constituent of flexible fibers found in certain sponge skeletons
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spongin
nounspon·gin | \ ˈspən-jən \
\Medical Definition of spongin
: a scleroprotein that is the chief constituent of flexible fibers in sponge skeletons
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Time Traveler for spongin
The first known use of spongin was circa 1868
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