| PPD | packs per day; paraphenylenediamine; percussion and postural drainage; permanent partial disability;... |
|---|---|
| REE | rapid extinction effect; rare earth element; resting energy expenditure |
| PPDs | (Tuberculin) Purified Protein Derivatives |
| HP | halogen phosphorus; handicapped person; haptoglobin; hard palate; Harvard pump; health profession(al... |
| PAP | pancreatitis-associated protein; Papanicolaou [test]; papaverine; passive-aggressive personality; pa... |
| LEO | Low Earth Orbit |
|---|---|
| REE | Rare Earth Elements |
| 32P | Purified |
| PPI | Purified Pork Insulin |
| PPD | Purified Protein Derivate |
| siliceous | Containing silica. (09 Oct 1997) |
|---|---|
| purified cotton | Absorbent cotton in which the hairs of the seed of varieties of Gossypium and other allied species are freed from adhering impurities, deprived of fatty matter, bleached, and sterilised; used for tampons, etc. (05 Mar 2000) |
| purified ozokerite | A natural mixture of hydrocarbons of high molecular weight; a substitute for beeswax, also used in dentistry for impressions. Synonym: cerin, cerosin, earth wax, mineral wax, purified ozokerite. (05 Mar 2000) |
| purified placental protein | human placental lactogen |
| purified protein derivative of tuberculin | Purified tuberculin containing the active protein fraction; the tuberculin from which it is prepared differs from tuberculin chiefly in that the bacteria are grown in a synthetic rather than in a broth medium. (05 Mar 2000) |
| purified water | Water obtained by distillation or deionization. (05 Mar 2000) |
| alkali earth metal | See: alkaline earth elements. (05 Mar 2000) |
| alkaline earth | <chemistry> Any of the metallic elements found in the second column of the periodic table, such as calcium and magnesium. (09 Oct 1997) |
| alkaline earth elements | Those element's in the family Be, Mg, Ca, Sr, Ba, and Ra, the hydroxides of which are highly ionised and hence alkaline in water solution. (05 Mar 2000) |
| rare earth elements | Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another. Synonym: rare earth elements. Origin: Lanthanum, first element of the series (05 Mar 2000) |
| rare earth metal | Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another. Synonym: rare earth elements. Origin: Lanthanum, first element of the series (05 Mar 2000) |
| rare-earth screen | An intensifying screen made of a rare-earth oxide phosphor, more efficient than calcium tungstate, especially at the higher kilovoltages used in modern radiography. (05 Mar 2000) |
| metals, alkaline earth | Metals that constitute the group IIa in the periodic table. (12 Dec 1998) |
| metals, rare earth | Elements of group IIIb of the periodic table from lanthanum, atomic number 57, to and including lutetium, atomic number 71. (12 Dec 1998) |
| diatomaceous earth | A type of silica-rich dirt which is soft, fine-grained, porous, light-coloured, and composed of the skeletons of diatoms (one-celled marine organisms with skeletons based on silicon). It is used as a filter. (09 Oct 1997) |
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