| n. | 1. | (Aëronautics) An aëroplane with two main supporting surfaces one above the other. |
| a. | 1. | (Aëronautics) Having, or consisting of, two superposed planes, aërocurves, or the like; of or pertaining to a biplane; |
| Noun | 1. | biplane - old fashioned airplane; has two wings one above the other |
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