léi​guǎn

detonator

雷管 léi​guǎn
detonator noun
a small device or tube containing a sensitive explosive used to trigger a main explosive charge

The construction crew carefully checked the detonators before the blast.

Frequency

Movie subtitles
2.47 per million appears in 1% of films
Written text
1.23 per million

Sources

Definitions
CC-CEDICT