im·pac·tion /ɪmˈpækʃən/
 裝緊,壓緊


 im·pac·tion /ɪmˈpækʃən/ 名詞
 嵌入,嵌塞,阻生(牙科)


 Im·pac·tion n.
 1. Surg. The driving of one fragment of bone into another so that the fragments are not movable upon each other; as, impaction of the skull or of the hip.
 2. An immovable packing; Med., a lodgment of something in a strait or passage of the body; as, impaction of the fetal head in the strait of the pelvis; impaction of food or feces in the intestines of man or beast.

 ◄ ►


 impaction
      n 1: the condition of being pressed closely together and firmly
           fixed
      2: a disorder in which feces are impacted in the lower colon
      3: a disorder in which a tooth is so crowded in its socket that
         it cannot erupt normally [syn: impacted tooth]
      4: a sharp collision produced by striking or dashing against
         something [syn: impingement]