| A | B |
|---|
| biannual | occuring twice per year |
| biweekly | happening two times per week |
| bicycle | a cycle with two wheels |
| bicolor | having two colors |
| biangular | containing two angles |
| triangle | having three angles |
| trifocal | glasses with three focal areas |
| tricycle | a cycle with three wheels |
| tricolor | an object that contains three colors |
| triweekly | occuring three times per week |
| coeditor | equally editing a book |
| coauthor | authoring with another person |
| coexist | existing together in a habitat |
| cooperate | to work or act with another to accomplish a goal |
| cohabitate | living together in the same habitat |
| codefend | two people equally defending another person |
| copilot | to pilot with another |
| decrease | lessening the amount |
| defrost | removing the frost |
| devalue | to lessen the value |
| deforest | to remove trees from a forest |
| deflate | to reduce the amount of air pressure |
| dehumidifier | to remove water from the air |
| dethrone | taking down off the throne |
| decompose | matter breaking down |
| derail | a train coming off the rails |
| descend | to go down |
| encircle | to surround with a circle |
| entrust | to give your trust in someone |
| enthrone | to put into a throne |
| enable | to make able |
| enchain | to place in chains |
| endanger | to put in a dangerous situation |
| enslave | to make a slave |
| encourage | to provide courage |
| entrap | to put into a trap |
| ensure | to make sure |
