from The Century Dictionary and Cyclopedia
- n. One of the vesicular or cystic tentacles of a hydrozoan; a marginal body representing a reduced and modified tentacle, whose axis is a hollow endodermal process that distinguishes it from the other kinds of marginal bodies, which are wholly of ectodermal origin, as ocellicysts and otocysts. Also tentaculocyst. See lithocyst, and cut under Steganophthalmata.
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