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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| the offspring of a zebra and a donkey. |
| earth science | |
| —n | |
| any of various sciences, such as geology, geography, and geomorphology, that are concerned with the structure, age, and other aspects of the earth | |
| earth science
Any of several sciences, such as geology, oceanography, and meteorology, that study the origin, composition, and physical features of the Earth. |