| A | B |
| tachygraphy | The art or practice of rapid writing or shorthand. |
| tachistoscope | A devise that projects a series of images on a screen at rapid speed to test visual perception, memory and learning. |
| tachometer | An instrument used to measure the rotations per minute of a rotating shaft. |
| tardy | Occurring, arriving, or acting after the scheduled time; late. |
| retard | To cause to move slowly; delay or impede. |
| tardigrade | Slow in action; slow moving. |
| tenuous | Long and thin; slender. Having little substance; flimsy. |
| attenuate | To make thin. To reduce, as in force or amount; weaken. |
| extenuate | To attempt to lessen the seriousness of, especially by prociding partial excuses. To make thin; to reduce the strength of. i.e. extenuating circumstances. |
| valiant | A brave person. |
| valid | Well grounded; just. |
| prevail | To be greater in strength or influence; to win. |
| ample | Of large size, amount, extent, or capacity. |
| amplify | To make larger or more powerful; increase. |
| amplitude | Greatness of size; magnitude. |
| xeroderma | Excessive or abnormal dryness of skin. |
| xerography | A dry photocopying process in which a negative image formed by powder is electrically transferred to paper or other surface. |
| xerothermic | Both dry and hot. |