| theta | A letter of the Greek alphabet corresponding to th in English; sometimes called the unlucky letter, from being used by the judges on their ballots in passing condemnation on a prisoner, it being the first letter of the Greek qanatos, death. <mathematics> Theta function, one of a group of functions used in developing the properties of elliptic functions. Origin: L, fr. Gr. Qh^ta, the Greek letter <theta/, <THETA/. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| theta antigen | A surface glycoprotein that is present on thymocytes of mice and rats. (05 Mar 2000) |
| theta pinch | <radiobiology> A fast-pulsed pinch device in which the external current imposed goes in the azimuthal/circumferential direction (generally in a solenoid) around a cylindrical plasma. Use of a fast-rising solenoidal current causes a rapidly increasing axial magnetic field, which compresses and heats the plasma. Magnetohydrodynamic theory of the Theta Pinch is given in reference 6. (09 Oct 1997) |
| theta rhythm | Brain waves in the electroencephalogram which have a frequency of 4 to 7 per second. They occur mainly in children but also in adults during periods of emotional stress. (12 Dec 1998) |
| theta wave | Brain waves in the electroencephalogram which have a frequency of 4 to 7 per second. They occur mainly in children but also in adults during periods of emotional stress. (12 Dec 1998) |