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1. Used in biological contexts to describe a crossing. (In Latin anatomical terms the form decussatio is used, e.g. decussatio pyramidum). In anatomy the term chiasma or chiasm means much the same as decussation. (

2. A crossing or intersection of lines etc. so as to form an X-shape. (

Syn: Chiasma, chiasm

Word origin: Latin decussatus, crossed like the letter X.

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