| pyramidion | Origin: NL, from L. Pyramis. See Pyramid. The small pyramid which crowns or completes an obelisk. Source: Websters Dictionary (01 Mar 1998) |
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| pyramidoid | A solid resembling a pyramid. Synonym: pyramoid. Origin: Gr, pyramid + -id: cf. F. Pyramidoide. Source: Websters Dictionary (01 Mar 1998) |
| pyramidotomy | Section of pyramidal tracts, in the spinal cord, for the relief of involuntary movements. Origin: G. Pyramis, pyramid, + tome, incision Medullary pyramidotomy, a medullary pyramidal tractotomy. Spinal pyramidotomy, a spinal pyramidal tractotomy. (05 Mar 2000) |
| pyramin | 4-amino-5-hydroxymethyl-2-methylpyrimidine;one of the products resulting from the hydrolysis of thiamin by thiaminase and appearing in the urine; a competitive inhibitor of pyridoxal. Synonym: pyramin, pyramine. (05 Mar 2000) |
| pyramis | A pyramid. Source: Websters Dictionary (01 Mar 1998) |
| pyramis medullae oblongatae | An elongated, white prominence on the ventral surface of the medulla oblongata on either side along the anterior median fissure, corresponding to the pyramidal tract. Synonym: pyramis medullae oblongatae, anterior column of medulla oblongata, anterior pyramid. (05 Mar 2000) |
| pyramis renalis | One of a number of pyramidal masses seen on longitudinal section of the kidney; collectively, they constitute the renal medulla, and contain part of the secreting tubules and the collecting tubules. Synonym: pyramis renalis, malpighian pyramid, medullary pyramid. (05 Mar 2000) |
| pyramis tympani | A conical projection posterior to the vestibular window in the middle ear; it is hollow and contains the stapedius muscle. Synonym: pyramid of tympanum, pyramidal eminence, pyramis tympani. (05 Mar 2000) |
| pyramis vermis | A subdivision of the inferior vermis of the cerebellum between the tuber and the uvula. Synonym: pyramis vermis, cerebellar pyramid. Pyramid of vestibule, the upper triangular extremity of the crista vestibuli. Synonym: pyramis vestibuli. (05 Mar 2000) |
| pyramis vestibuli | pyramid of vestibule |
| pyran | A cyclic compound that may be considered the formal parent of sugars with an oxygen bridge from carbon atoms 1 to 5 (the pyranoses). (05 Mar 2000) |
| pyran copolymer | <chemical> 2,5-furandione polymer with 1,1'-oxybis(ethene). Copolymer of divinyl ether and maleic anhydride that is acts as an immunostimulant with antineoplastic and anti-infective properties. It is used also in combination with other antineoplastic agent. Pharmacological action: antineoplastic agent, antiviral agents, interferon inducers. Chemical name: 2,5-Furandione, polymer with 1,1'-oxybis(ethene) (12 Dec 1998) |
| pyranone | A keto derivative of pyran. Synonym: pyranone. (05 Mar 2000) |
| pyranose | <chemical> Sugar structure in which the carbonyl carbon is condensed with a hydroxyl group (i.e. In a hemi acetal link), forming a ring of five carbons and one oxygen. most hexoses exist in this form, although in sucrose, fructose is found with the smaller (four carbon) furanose ring. (18 Nov 1997) |
| pyranose ring | <chemistry> A six-membered cyclic haemiacetal or ketal. (09 Jan 1998) |