Spi‐ra′lo‐zo″oid (?), n. [Spiral + zooid. So called because they often have a spiral form when contracted.] (Zoöl.) One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.