Home › Military Science & Warfare › Nuclear Proliferation › fissile

fissile

FIS-syl ˈfɪsaɪl

adjectiveC2GRE

TechnicalFormal

(Of an atomic nucleus) capable of undergoing nuclear fission, especially by absorbing neutrons. More generally, easily split or cleaved.

Specifically refers to materials that can sustain a nuclear chain reaction, making them suitable for nuclear weapons or reactors. It's a precise scientific term.

The story behind the word. The word 'fissile' is derived from the Latin verb `findere`, which means 'to split.' The suffix `-ile` is often used to indicate capability or aptitude. The term was specifically coined in the context of nuclear physics in the mid-20th century to describe materials like Uranium-235 and Plutonium-239 that can be split to release tremendous amounts of energy in a chain reaction.

Word relationships

cleavable: Capable of being split, often along natural planes.
splittable: General term for something that can be split.
fissionable: Often used interchangeably with 'fissile' in nuclear physics, though 'fissile' specifically implies fission by slow neutrons.

infissile: Not capable of being split or undergoing fission.

Commonly confused with

fragile: 'Fragile' means easily broken; 'fissile' means capable of being split, often in a controlled or specific manner (like nuclear fission).

Word family

fission (noun/verb): The action of splitting or dividing into two or more parts; nuclear fission is the splitting of an atomic nucleus.

Collocations

fissile material
fissile isotope
highly fissile
fissile core

Example sentences

"Uranium-235 and Plutonium-239 are the primary fissile materials used in nuclear weapons and reactors." In a discussion about nuclear physics.
"The experiment aimed to determine the precise conditions under which the new isotope would become fissile." Explaining the properties of a material.
"Certain types of shale are highly fissile, easily splitting into thin layers." Referring to geological properties.

Memory hook

Think of a 'FIS-sure' (a crack or split in rock) – fissile materials are those that can be split, especially in a nuclear reaction. Easily split (nuclear).

When not to use

For something that merely breaks easily, use 'fragile,' 'brittle,' or 'breakable.' 'Fissile' has a specific nuclear or geological context.

Fun facts

Only a few isotopes are fissile, with Uranium-235 being the only naturally occurring one in significant quantities. Plutonium-239 is produced artificially in nuclear reactors.

Related words

enrichment, warhead

Explore more words

precision, tensile, ductility, viable, ductile, hazardous