| pH | <chemistry> The symbol relating the hydrogen ion concentration or activity of a solution to that of a given standard solution. Numerically the pH is approximately equal to the negative logarithm of hydrogen ion concentration expressed in molarity. PH 7 is neutral, above 7 is alkaline and below is acidic. (18 Nov 1997) |
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| pH scale | The negative logarithm of the hydrogen ion concentration, used as a scale for expressing acidity and alkalinity. See: pH. Synonym: pH scale. (05 Mar 2000) |
| pH-stat | A device for continuously sensing the pH of a solution and automatically adding acid or alkali as necessary to keep the pH constant; used to follow the time course of reactions that liberate an acid or alkali. (05 Mar 2000) |
| Ph1 | <abbreviation> Philadelphia chromosome. (05 Mar 2000) |
| PHA | <abbreviation> Phytohemagglutinin. (05 Mar 2000) |
| phacellus | Origin: NL, fr. Gr. A bundle of fagots. <zoology> One of the filaments on the inner surface of the gastric cavity of certain jellyfishes. Source: Websters Dictionary (01 Mar 1998) |
| phaco- | 1. Lens-shaped, relating to a lens, 2. Birthmark; as in phacomatosis. Origin: G. Phakos, lentil (lens), anything shaped like a lentil (05 Mar 2000) |
| phacoanaphylactic uveitis | Intraocular inflammation occurring after extracapsular cataract extraction;probably an immune reaction to the patient's liberated lenticular proteins. Synonym: lens-induced uveitis. (05 Mar 2000) |
| phacoanaphylaxis | Hypersensitivity to protein of the lens of the eye. (05 Mar 2000) |
| phacocele | Hernia of the lens of the eye through the sclera. Origin: phaco-+ G. Kele, hernia (05 Mar 2000) |
| phacochere | <zoology> The wart hog. Origin: Gr. A lentil seed, a wart + a pig. Source: Websters Dictionary (01 Mar 1998) |
| phacocyst | Synonym: lens capsule. Origin: phaco-+ G. Kystis, bladder (05 Mar 2000) |
| phacocystectomy | Rarely used term for surgical removal of a portion of the capsule of the lens of the eye. Origin: phaco-+ G. Kystis, bladder, + ektome, excision (05 Mar 2000) |
| phacodonesis | Tremulousness of the lens of the eye. Origin: phaco-+ G. Doneo, to shake to and fro (05 Mar 2000) |
| phacoemulsification | A procedure for removal of the crystalline lens in cataract surgery in which an anterior capsulectomy is performed by means of a needle inserted through a small incision at the temporal limbus, allowing the lens contents to fall through the dilated pupil into the anterior chamber where they are broken up by the use of ultrasound and aspirated out of the eye through the incision. The small incision allows the surgeon to use very few or even no stitches to close the tiny wound. There is usually no need for hospitalization and patients may resume most activities within days. (12 Dec 1998) |