| two-sympathin theory | A theory, now obsolete, advanced by Cannon and Rosenblueth that two different types of substances (sympathin E and I) diffuse into circulation when adrenergic nerves are stimulated, although the mediator itself is the same. (05 Mar 2000) |
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| two-tail test | A statistical test based on the assumption that the data are distributed in both directions from some central value. (05 Mar 2000) |
| two-way catheter | A catheter with two lumens, allowing irrigation and aspiration. Synonym: two-way catheter. (05 Mar 2000) |
| twopence | A small coin, and money of account, in England, equivalent to two pennies, minted to a fixed annual amount, for almsgiving by the sovereign on Maundy Thursday. Source: Websters Dictionary (01 Mar 1998) |
| Twort | Frederick W., British bacteriologist, 1877-1950. See: Twort phenomenon, Twort-d'Herelle phenomenon. (05 Mar 2000) |
| Twort phenomenon | The lysis of bacteria by bacteriophage. Synonym: bacteriophagia, d'Herelle phenomenon, Twort phenomenon. (05 Mar 2000) |
| Twort-d'Herelle phenomenon | The lysis of bacteria by bacteriophage. Synonym: bacteriophagia, d'Herelle phenomenon, Twort phenomenon. (05 Mar 2000) |
| twyr | <radiobiology> Terawatt-year, Unit of energy equal to 3.15 x10^19 joules or 30 Quads (09 Oct 1997) |