1. Prefix denoting across, through, beyond; opposite of cis-.
2. In genetics, denoting the location of two genes on opposite chromosomes of a homologous pair.
3. In organic chemistry, a form of geometric isomerism in which the atoms attached to two carbon atoms, joined by double bonds, are located on opposite sides of the molecule.
4. In biochemistry, a prefix to a group name in an enzyme name or a reaction denoting transfer of that group from one compound to another; e.g., transformylase (transfers a formyl group), transpeptidation.
Origin: L. Trans, through, across