| phaeochromocytoma | <oncology, tumour> A normally benign neoplasia (neuroblastoma) of the chromaffin tissue of the adrenal medulla. In culture, the cells secrete enormous quantities of catecholamines and can be induced to form neuron like cells on addition of for example) cyclic AMP or nerve growth factor. Excessive production of adrenaline and noradrenaline leads to secondary hypertension, sometimes paroxysmal. (18 Nov 1997) |
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| phaeohyphomycosis | A group of superficial and deep infections caused by fungi that form pigmented hyphae and yeastlike cells in tissue, i.e., dematiaceous fungal infections other than chromoblastomycosis and mycetomas. In humans, cats, and horses, phaeohyphomycosis is caused by Drechslera spicifera; in chickens and turkeys by Dactylaria gallopava. Origin: G. Phaios, dusky, + hyphe, web, + mycosis (05 Mar 2000) |
| phaeomycotic cyst | A subcutaneous cystic granuloma caused by pigmented fungi, usually solitary and located on the extremities. (05 Mar 2000) |
| Phaeophyta | <botany> Division of algae, generally brown in colour, with multicellular, branched thalluses. Includes large seaweeds such as Laminaria and Fucus. The brown colour is due to the xanthophylls, fucoxanthin and lutein. Many have laminarin as a food reserve and alginic acid as a wall component. (18 Nov 1997) |
| phaeospore | <botany> A brownish zoospore, characteristic of an order (Phaeosporeae) of dark green or olive-coloured algae. Phaeospor"ic. Origin: Gr. Dusky + E. Spore. Source: Websters Dictionary (01 Mar 1998) |
| phaethon | 1. The son of Helios (Phoebus), that is, the son of light, or of the sun. He is fabled to have obtained permission to drive the chariot of the sun, in doing which his want of skill would have set the world on fire, had he not been struck with a thunderbolt by Jupiter, and hurled headlong into the river Po. 2. <ornithology> A genus of oceanic birds including the tropic birds. Origin: L, Phaethon (in sense 1), fr. Gr, fr, to shine. See Phantom. Source: Websters Dictionary (01 Mar 1998) |
| phaeton | 1. A four-wheeled carriage (with or without a top), open, or having no side pieces, in front of the seat. It is drawn by one or two horses. 2. See Phaethon. 3. <zoology> A handsome American butterfly (Euphydryas, or Melitaea, Phaeton). The upper side of the wings is black, with orange-red spots and marginal crescents, and several rows of cream-coloured spots; called also Baltimore. Origin: F. Phaeton a kind of carriage, fr. Phaethon Phaethon, the son of Helios. See Phaethon. Source: Websters Dictionary (01 Mar 1998) |
| phage | 1. Synonym for bacteriophage. 2. <suffix> Eating, devouring. Origin: L. Phagedaena, Gr Phago, To eat. (20 Jun 2000) |
| phage integrase family | <enzyme> Enzymes that mediate site specific recombination in prokaryotes. They fall into two families, phage integrases and resolvases. (18 Nov 1997) |
| phage typing | <microbiology> Bacteria may be typed by their susceptibility to a range of bacteriophages though confusion may arise if the bacteria carry plasmids encoding restriction endonucleases. (18 Nov 1997) |
| phagedena | <medicine> A canine appetite; bulimia. Spreading, obstinate ulceration. Origin: L. Phagedaena, Gr Phago, To eat. Source: Websters Dictionary (01 Mar 1998) |
| phagedena tropica | <infectious disease> An old term for the tropical ulcer of Old World, cutaneous leishmaniasis. (05 Mar 2000) |
| phagedenic | Relating to or having the characteristics of phagedena. (05 Mar 2000) |
| phagedenic ulcer | <dermatology> A rapidly spreading ulcer attended by the formation of extensive sloughing. Synonym: perambulating ulcer, sloughing ulcer, ulcus ambulans. Origin: L. Phagedaena, Gr Phago, To eat. (05 Mar 2000) |
| phagedenical | <medicine> Of, like, or pertaining to, phagedena; used in the treatment of phagedena; as, a phagedenic ulcer or medicine. A phagedenic medicine. Origin: L. Phagedaenicus, Gr., cf. F. Phagedenique. Source: Websters Dictionary (01 Mar 1998) |