Composed of, or relating to, two planes (flat surfaces extending infinitely in all directions). / (aviation) Having, or consisting of, two superposed planes, aerocurves, etc.

(aviation) An airplane that has two main wings, one above the other and supported by struts.

(intransitive, rare) To fly in a biplane.

plural of biplane

simple past tense and past participle of biplane

present participle of biplane

Of or relating to two planes; biplanar.

Involving two planets.