| pori | Plural of porus. (05 Mar 2000) |
|---|---|
| poria | Plural of porion. (05 Mar 2000) |
| porifera | <zoology> A grand division of the Invertebrata, including the sponges; called also Spongiae, Spongida, and Spongiozoa. The principal divisions are Calcispongiae, Keratosa or Fibrospongiae, and Silicea. Origin: NL, fr. L. Porus pore + ferre to bear. Source: Websters Dictionary (01 Mar 1998) |
| poriferan | <zoology> One of the Polifera. Source: Websters Dictionary (01 Mar 1998) |
| porime | <mathematics> A theorem or proposition so easy of demonstration as to be almost self-evident. Origin: Gr. Practicable. Source: Websters Dictionary (01 Mar 1998) |
| porin | <protein> Transmembrane matrix proteins (37 kD) found in the outer membranes of gram-positive bacteria. Associate as trimers to form channels (1 nm diameter, ca 10exp5 per bacterium) through which hydrophilic molecules of up to 600D can pass. Similar porins are also found in outer mitochondrial membranes (VDAC, voltage dependent anion selective channel). (14 Oct 1997) |
| porins | Protein molecules situated in the outer membrane of bacteria that, in dimeric or trimeric form, constitute a water-filled transmembrane channel allowing passage of ions and other small, relatively non-specific molecules. Porins are also found in mitochondria and plants. (12 Dec 1998) |
| poriomania | <psychiatry> A morbid impulse to wander or journey away from home. Origin: G. Poreia, a journey, + mania, frenzy (05 Mar 2000) |
| porion | The central point on the upper margin of the external auditory meatus; as a cephalometric landmark, it is located in the middle of the metal rods of the cephalometer. Origin: G. Poros, a passage (05 Mar 2000) |
| porism | 1. <geometry> A proposition affirming the possibility of finding such conditions as will render a certain determinate problem indeterminate or capable of innumerable solutions. 2. <geometry> A corollary. Three books of porisms of Euclid have been lost, but several attempts to determine the nature of these propositions and to restore them have been made by modern geometers. Origin: Gr. A thing procured, a deduction from a demonstration, fr. To bring, provide: cf. F. Porisme. Source: Websters Dictionary (01 Mar 1998) |
| porite | <zoology> Any coral of the genus Porites, or family Poritidae. An important genus of reef-building corals having small twelve-rayed calicles, and a very porous coral. Some species are branched, others grow in large massive or globular forms. Origin: NL, fr. Gr. A pore. Source: Websters Dictionary (01 Mar 1998) |