hypnocyst

from The Century Dictionary.

• noun A sleeping cyst; a quiescent encysted protozoan which does not sporulate.
• noun In botany, same as akinete.

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

• noun (Biol.) A cyst in which some unicellular organisms temporarily inclose themselves, from which they emerge unchanged, after a period of drought or deficiency of food. In some instances, a process of spore formation seems to occur within such cysts.

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

• noun biology A cyst in which some unicellular organisms temporarily enclose themselves, from which they emerge unchanged, after a period of drought or deficiency of food.