| pointer | One who, or that which, points. Specifically: The hand of a timepiece. <zoology> One of a breed of dogs trained to stop at scent of game, and with the nose point it out to sportsmen. <astronomy> Diagonal braces sometimes fixed across the hold. Source: Websters Dictionary (01 Mar 1998) |
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| pointillage | A massage manipulation with the tips of the fingers. Origin: Fr. Dotting, stippling (05 Mar 2000) |
| pointing | Preparing to open spontaneously, said of an abscess or a boil. (05 Mar 2000) |
| pointleted | <botany> Having a small, distinct point; apiculate. Source: Websters Dictionary (01 Mar 1998) |
| points of convergence | <microscopy> In colour video cameras and monitors, the precise alignment of the images or pictures in the three primary colours (red, green and blue). A lack of convergence gives rise to asymmetrically coloured fringes. (05 Aug 1998) |
| points, conjugate | <microscopy> The pair of points on the principal axis of a mirror or lens so located that light emitted from either point will be focused at the other. Related points in the object and image are located optically so that one is the image of the other. See: polarizing element (05 Aug 1998) |
| Poirier's gland | A lymph node on the uterine artery where it crosses the ureter. (05 Mar 2000) |
| Poirier's line | A line extending from the nasion to the lambda. (05 Mar 2000) |
| Poirier, Paul | <person> French surgeon, 1853-1907. See: Poirier's gland, Poirier's line. (05 Mar 2000) |
| poise | In the CGS system, the unit of viscosity equal to 1 dyne-second per square centimeter and to 0.1 pascal-second. Origin: J. Poiseuille (05 Mar 2000) |
| poiser | <zoology> The balancer of dipterous insects. Source: Websters Dictionary (01 Mar 1998) |
| Poiseuille's law | In laminar flow, the volume of a homogeneous fluid passing per unit time through a capillary tube is directly proportional to the pressure difference between its ends and to the fourth power of its internal radius, and inversely proportional to its length and to the viscosity of the fluid. (05 Mar 2000) |
| Poiseuille's space | The layer of the bloodstream in the capillary vessels, next to the wall of the vessel, that flows slowly and transports the white blood cells along the layer wall, while in the centre the flow is rapid and transports the red blood cells. Synonym: plasma layer, Poiseuille's space, sluggish layer. (05 Mar 2000) |
| Poiseuille's viscosity coefficient | An expression of the viscosity as determined by the capillary tube method; the coefficient η = (πPr4t/8vl), where P is the pressure difference between the inlet and outlet of the tube, r the radius of the tube, l its length, and v the volume of liquid delivered in the time t. If volume is in cm3, time is in seconds, and l and r are in cm, then n will be in poise. (05 Mar 2000) |
| Poiseuille, Jean Leonard Marie | <person> French physiologist and physicist, 1797-1869. See: poise, Poiseuille's viscosity coefficient, Poiseuille's law, Poiseuille's space. (05 Mar 2000) |