名詞 concussion:

1. injury to the brain caused by a blow; usually resulting in loss of consciousness
2. any violent blow

1. The patient is suffering from severe concussion following a blow to the head.
   患者頭部受擊後患嚴(yán)重腦震蕩。

con.cus.sion

n.（名詞）
A violent jarring; a shock.See Synonyms at collision
震蕩：劇烈的撣擊；震蕩參見 collision
An injury to an organ, especially the brain, produced by a violent blow and followed by a temporary or prolonged loss of function.
腦震蕩：腦震蕩，對器官特別是大腦因受猛烈撞擊而造成暫時(shí)或長期的功能喪失傷害

來源：
Middle English concussioun [bruise, contusion]
中古英語 concussioun [擦傷，挫傷]
from Latin concussiô concussiôn- [concussion]
源自 拉丁語 concussiô concussiôn- [震蕩]
from concussus [past participle of] concutere [to strike together] * see concuss
源自 concussus [] concutere的過去分詞 [一起打] *參見 concuss

【引伸】
concus.sive
concus.sively
adv.（副詞）