spongin

[spuhn-jin]
noun
a scleroprotein occurring in the form of fibers that form the skeleton of certain sponges.

Origin:
1865–70; sponge + -in2

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World English Dictionary
spongin (ˈspʌndʒɪn)
 
n
a fibrous horny protein that forms the skeletal framework of the bath sponge and related sponges
 
[C19: from German, from Latin spongiasponge + -in]

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Example sentences
These are characterized by skeletons composed of an organic substance called spongin.
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