spongin

(spun′jin)

noun

a sulfur-containing protein making up the resilient fibrous network that forms the skeleton in many sponges

Origin: Ger < L spongia, sponge + Ger -in, -ine

See spongin in American Heritage Dictionary 4

noun

A horny, sulfur-containing protein related to keratin that forms the skeletal structure of certain classes of sponges.

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