abstriction

from The Century Dictionary.

• noun The act of unbinding or loosening.
• noun In botany, a method of cell-formation in some of the lower cryptogams, differing from ordinary cell-division in the occurrence of a decided constriction of the walls at the place of division.

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

• noun biology, mycology A method of spore formation in fungi in which successive portions of the sporophore are cut off through the growth of septa; abjunction.