impaction noun. [ɪm'pakʃ(ǝ)n] M18.
[from IMPACT verb + -ION.]
1. The action of becoming or condition of being impacted. M18.

2. spec. in Medicine. The lodging of a mass of (usu. hardened) faeces in the intestine so that defecation is prevented or impeded; the obstruction so caused. M19.
b. An impacted mass of faeces. E20.

3. The action or process of causing a body to impact on a surface etc. M20.

[TahlilGaran] English Dictionary ▲