Definitions

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.

Etymologies

Latin; see sker-2 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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