spallation noun. [spǝ'leɪʃ(ǝ)n] M20.
[from SPALL verb + -ATION.]
1. Nuclear Physics. The detachment of a number of nucleons, esp. neutrons, from a larger nucleus, esp. as a result of the impact of an energetic particle. M20.

2. Geology. Separation of fragments from the surface of a rock by interaction with a compression wave (esp. by micrometeoritic impact). L20.

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