a scleroprotein occurring in the form of fibers that form the skeleton of certain sponges.
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How to use spongin in a sentence
In other species the spongin is intermixed with spicules of silica, or of carbonate of lime, in various shapes.The Sea-beach at Ebb-tide | Augusta Foote Arnold
The amount of spongin present is also different in different species.
The consistency of a sponge depends on two factors—the number of spicules present, and the amount of spongin.
Spicules forming triangular meshes and occasionally arranged in vertical lines several spicules broad but without spongin.
You better hustle ahead with your spongin' off; I'm just about through here!The Deserter, and Other Stories | Harold Frederic
British Dictionary definitions for spongin
a fibrous horny protein that forms the skeletal framework of the bath sponge and related sponges
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012