Noun
げんせん
原子力潜水艦は、略して原潜と呼ばれることもある。
Nuclear submarines are sometimes called Gensen, for short.
The original (often associated with atoms and nuclear tech) concealing machine is the nuclear submarine. It is nuclear, and it conceals itself.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.