blastostyle

from The Century Dictionary.

• noun In zoology, a columniform zoöid destined to give origin to generative buds; a long simple zoöid, without mouth or tentacles. Also called gonoblastidium.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See hydroidea, and athecata.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology In certain hydroids, an imperfect zooid whose special function is to produce medusoid buds.