fissile
adjective uk/ˈfɪs.aɪl/ us/ˈfɪs.əl/
geology specialized易裂的; 易分开的（岩石）
(of rock) able to be divided easily into pieces
Because of its layered structure, mica is fissile. 云母是分层结构的，所以很容易裂开。
physics specialized（原子）可进行核裂变的
(of atoms) able to produce nuclear fission
An amount of fissile material was missing as a result of the accident. 一些可裂变物质因为这起意外事故丢失。