- Prefix (in italics) denoting across, through, beyond; opposite of cis-.
- In genetics, a prefix denoting the location of two genes on opposite chromosomes of a homologous pair.
- In organic chemistry (in italics), 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.
- 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; transformylase (transfers a formyl group), transpeptidation.
[L. trans, through, across]
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Examples: glitazone, GI cocktail, etc.