Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A horny, sulfur-containing protein related to keratin that forms the skeletal structure of certain classes of sponges proteinaceous compounds of which the spicules in Demospongiae are composed.

from the GNU version of the Collaborative International Dictionary of English

  • n. The chemical basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll.

from The Century Dictionary and Cyclopedia

  • n. The proper horny or fibrous substance of sponges; ceratose or ceratode. Also spongiolin.

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