: not capable of undergoing fission : not fissionable nonfissionable uranium.

What's the meaning of fissile?

1. fissile - capable of undergoing nuclear fission; "a fissionable nucleous"; "fissionable material"

What does it mean when something is fertile?

fertile, fecund, fruitful, prolific mean producing or capable of producing offspring or fruit. fertile implies the power to reproduce in kind or to assist in reproduction and growth fertile soil ; applied figuratively, it suggests readiness of invention and development.