from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The bundle of fibrils that constitutes the central core of a cilium or flagellum.
- n. The axial thread of a chromosome.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bundle of nine microtubules forming the internal scaffolding of a cilium, with two extra central microtubules connecting the others if the cilium is motile
from The Century Dictionary and Cyclopedia
- n. One of the threads or strands in the central portion of the contractile stalk of Vorticellidæ.
Greek axōn, axis + Greek nēma, thread; see (s)nē- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)