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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. |
| a gadget; dingus; thingumbob. |
| back mutation | |
| —n | |
| genetics the reversion of a mutant to the original phenotype | |
| Main Entry: | back mutation |
| Part of Speech: | n |
| Definition: | See reverse mutation |