from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Anatomy A crest or ridge, as on the top of a bone.
- n. Biology One of the inward projections or folds of the inner membrane of a mitochondrion.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The internal compartments formed by the inner membrane of a mitochondrion, where many chemical reactions take place.
Latin; see sker-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)