Definition of "annulate" []

• Having or consisting of rings or ringlike segments. (adjective)

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.

• "In eggs with yolk, whether vertebrate or annulate, there is always a separation into an animal and a plastic layer."
• "In some animals, _e. g._, sea-urchins, the skeleton is a simple sphere; in others, _e. g._, starfish, secondary rows of spheres radiate out from a central sphere or ring; in annulate animals the skeleton consists of a row of partially fused spheres."
• "Thus vertebrate and annulate embryos agree in certain points at the time of the formation of the primitive streak."