from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Anatomy A crossing or intersection of two tracts, as of nerves or ligaments.
  • n. Genetics The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A crossing of two nerves, ligaments etc.
  • n. The contact point between the two chromatids of a chromosome during meiosis.

from The Century Dictionary and Cyclopedia

  • n. Same as chiasm.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an intersection or crossing of two tracts in the form of the letter X


Greek khīasma, cross-piece, from khīazein, to mark with an X, from khei, khī, chi (from the letter's shape).
(American Heritage® Dictionary of the English Language, Fourth Edition)
Modern Latin, from Ancient Greek χίασμα, from χίαζειν ("to mark with the letter chi"). (Wiktionary)



Log in or sign up to get involved in the conversation. It's quick and easy.