| gatc | An abbreviation which stands for the four nitrogenous bases that are found in DNA: Guanine, Adenine, Thymine, and Cytosine. (09 Oct 1997) |
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| Gatch | Willis D., U.S. Surgeon, 1878-1961. See: Gatch bed. (05 Mar 2000) |
| Gatch bed | A bed with divided sections for independent elevation of a patient's head and knees. (05 Mar 2000) |