Definition of "sertularian" []

• Any of various colonial hydroids of the genus Sertularia, having stalkless polyps arranged in pairs along a long branching stem. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This special sertularian grows up right in my pool on stones or often on seaweeds, but I have here (Fig. 5) another and much smaller one which lives literally in millions hanging its cups downwards."
• "Ah! you will say, you are now showing me a polyp like those on the sertularian tree."