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.

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.