What does "fission bomb" mean?

An atomic bomb that uses nuclear fission as a source of energy

What is a synonym for "fission bomb"?

Common synonyms include: a-bomb, atom bomb, atomic bomb, plutonium bomb.

noun

noun ·Rare ·Advanced level

Noun

1
An atomic bomb that uses nuclear fission as a source of energy
"I heard the fission bomb test clearly and I was over a hundred miles away."
2
a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239) wordnet

"I heard the fission bomb test clearly and I was over a hundred miles away."