| PTA | <abbreviation> Plasma thromboplastin antecedent; phosphotungstic acid; percutaneous transluminal angioplasty. (05 Mar 2000) |
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| PTA stain | <technique> The first general stain used for electron microscopy; a selective stain for extracellular components such as elastin, collagen, and basement membrane mucopolysaccharides; it can be followed by uranyl acetate or lead. Synonym: PTA stain. (05 Mar 2000) |
| PTAH | <abbreviation> Phosphotungstic acid haematoxylin. (05 Mar 2000) |
| ptarmic | Synonym: sternutatory. Origin: G. Ptarmikos, causing to sneeze, fr. Ptarmos, a sneezing (05 Mar 2000) |
| ptarmigan | <zoology> Any grouse of the genus Lagopus, of which numerous species are known. The feet are completely feathered. most of the species are brown in summer, but turn white, or nearly white, in winter. They chiefly inhabit the northern countries and high mountains of Europe, Asia, and America. The common European species is Lagopus mutus. The Scotch grouse, red grouse, or moor fowl (L. Scoticus), is reddish brown, and does not turn white in winter. The white, or willow, ptarmigan (L. Albus) is found in both Europe and America. Origin: Gael. Tarmachan; cf. Ir. Tarmochan, tarmonach. Source: Websters Dictionary (01 Mar 1998) |
| ptarmus | Sneezing. Origin: G. Ptarmos, a sneezing (05 Mar 2000) |