| TAB vaccine | A suspension of killed typhoid and paratyphoid A and B bacilli. See: typhoid vaccine. Synonym: TAB vaccine. (05 Mar 2000) |
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| talion | The principle of retribution in intrapsychic behaviour. Origin: Welsh tal, compensation (05 Mar 2000) |
| talion dread | The symbolic anxieties that represent the unconscious dread of penalties for an act. (05 Mar 2000) |