| catechu nigrum | Black catechu, an extract of the heart wood of Acacia catechu (family Leguminosae), used as an astringent in diarrhoea. Synonym: cutch. (05 Mar 2000) |
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| pigmentum nigrum | Melanin of the choroid coat of the eye. (05 Mar 2000) |
| piper | 1. One who plays on a pipe, or the like, especially. On a bagpipe. "The hereditary piper and his sons." 2. <zoology> A common European gurnard (Trigla lyra), having a large head, with prominent nasal projection, and with large, sharp, opercular spines. A sea urchin (Goniocidaris hystrix) having very long spines, native of both the American and European coasts. To pay the piper, to bear the cost, expense, or trouble. Source: Websters Dictionary (01 Mar 1998) |
| Piper, E | <person> U.S. Obstetrician-gynecologist, 1881-1935. See: Piper's forceps. (05 Mar 2000) |
| Piper's forceps | Obstetrical forceps used to facilitate delivery of the head in breech presentation. (05 Mar 2000) |
| tapetum nigrum | The outer layer of the retina, consisting of pigmented epithelium. Synonym: ectoretina, stratum pigmenti bulbi, stratum pigmenti retinae, tapetum nigrum, tapetum oculi. (05 Mar 2000) |