| Word root/ prefix | Root Meaning | Words based on the Root |
| Tox | poison | Detoxification - The process of removing poisons Toxic - Poisonous Toxicology - The study of poisons Intoxicated - Influenced by drugs. |
| Trans | Across, beyond, through | Transcontinental - Across the continent Transfer - To move from one place to another Transport - to carry something across a space. |
| Tri | three, once in every three, | Triangle - A figure with 3 sides and 3 angles Triathlon - An athletic contest with 3 events Tricycle - A 3-wheel vehicle with pedals. |
| Un | Not, opposite of, lacking | Unabridged - Not shortened Unfair - Opposite of fair Unfriendly - Lacking friendliness. |
| Uni | One, single | Unicycle - A vehicle with one wheel Unilateral - Decided by only one person or nation Unique - The only one of its kind Unison - As one voice. |