1. A combining form or prefix meaningover, beyond, across, through and through, into another state or place, surpassing, transcending, on the other side, as in transalpine, beyond the Alps; transform, to form through and through, that is, anew, transfigure.

Examples include: transcontinental, transgress, transatlantic, transonic, transform, transcribe, transfinite.

2. <chemistry> An isomer having the same atom or group on opposite sides of a given plane in the molecule. Having a higher atomic number than (transuranic).

Antonyms: cis-.

Origin: L. trans across, over.

(05 Feb 2009)