from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An organelle found within certain unicellular eukaryotes which lack mitochondria.
from The Century Dictionary and Cyclopedia
- n. In cytology, a body formed from the spindle-fibers of the secondary spermatocytes, said to give rise to the middle-piece and tail envelop of the spermatozoön: probably equivalent to the ‘Nebenkern’ of La Valette St. George.
From mito- + -some. (Wiktionary)