| the offspring of a zebra and a donkey. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| Carson (kär'sən) Pronunciation Key
American marine biologist and writer whose best-known book, Silent Spring (1962), was an influential study of the dangerous effects of synthetic pesticides on food chains. Public reaction to the book resulted in stricter controls on pesticide use and shaped the ideas of the modern environmental movement. |