strobilation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Asexual reproduction by division of the body into segments, as in tapeworms and jellyfish.

from The Century Dictionary.

• noun Formation or production of strobiles; metameric division of a scyphistoma or hydra tuba into medusæ.
• noun Gemmation of the successive links or joints of a tapeworm; also, the transverse fission of various worms.

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

• noun (Zoöl.) The act or phenomenon of spontaneously dividing transversely, as do certain species of annelids and helminths; transverse fission. See Illust. under syllidian.

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

• noun biology A form of asexual reproduction by division into body segments, as in tapeworms and jellyfish