| n. | 1. | the radioactive particles that settle to the ground after a nuclear explosion. |
| 2. | the falling to the ground of radioactive particles lifted into the atmosphere by a nuclear explosion. | |
| 3. | an incidental or unexpected effect, especially one which is undesirable, consequent to an event or process; ; - usually used only in the singular; | |
| 4. | (Med.) one selected from a group by some criterion. | |
| 5. | one who fails to maintain the same pace as and lags behind a group of which s/he is a member. |
| Noun | 1. | fallout - the radioactive particles that settle to the ground after a nuclear explosion Synonyms: radioactive dust |
| 2. | fallout - any adverse and unwanted secondary effect; "a strategy to contain the fallout from the accounting scandal" Synonyms: side effect |