| mesonephric tissue | Intermediate mesoderm situated in the thoracic and lumbar regions of the embryo or foetus; it evolves into the mesonephros and associated structures. (05 Mar 2000) |
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| mesonephric tubule | An excretory tubule of the mesonephros. Synonym: segmental tubule. (05 Mar 2000) |
| mesonephroi | Plural of mesonephros. (05 Mar 2000) |
| mesonephroid tumour | A rare tumour of the female genital tract, most often the ovary, formerly considered to be derived from mesonephric rests. Two varieties are recognised: (1) clear cell carcinoma, so called because of its histologic resemblance to renal cell carcinoma, and now considered to be of muellerian duct derivation and (2) an embryonal tumour (called also endodermal sinus tumour and yolk sac tumour), occurring chiefly in children. The latter variety may also arise in the testis. (12 Dec 1998) |
| mesonephroma | A rare tumour of the female genital tract, most often the ovary, formerly considered to be derived from mesonephric rests. Two varieties are recognised: (1) clear cell carcinoma, so called because of its histologic resemblance to renal cell carcinoma, and now considered to be of muellerian duct derivation and (2) an embryonal tumour (called also endodermal sinus tumour and yolk sac tumour), occurring chiefly in children. The latter variety may also arise in the testis. (12 Dec 1998) |
| mesonephros | <anatomy> The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body. Origin: NL, fr. Gr. Middle + kidney. Source: Websters Dictionary (01 Mar 1998) |
| mesoneuritis | Inflammation of a nerve or of its connective tissue without involvement of its sheath. Nodular mesoneuritis, inflammation of the connective tissue beneath the nerve sheath, with the formation of circumscribed fibrous thickenings. (05 Mar 2000) |
| mesonotum | <zoology> The dorsal portion of the mesothorax of insects. Origin: NL, fr. Gr. Middle + the back. Source: Websters Dictionary (01 Mar 1998) |
| mesons | Short-lived elementary particles found in cosmic radiation or produced from nuclear disintegration. Their mass is between that of protons and electrons and they can be negative, positive, or neutral. Pi-mesons (pions) are heavier than mu-mesons (muons) and are proposed for cancer radiotherapy because their capture and disintegration by matter produces powerful, but short-lived, secondary radiation. (12 Dec 1998) |
| mesopexy | Fixation or attachment of a torn or incised mesentery. Synonym: mesopexy. Origin: mesentery + G. Pexis, fixation (05 Mar 2000) |
| mesophase | <biochemistry> Arrangement of phospholipids in water where the liquid crystalline phospholipids form multi layered parallel plate structures, each layer being a bilayer, the layers separated by aqueous medium. (18 Nov 1997) |
| mesophil | Mesophile A microorganism with an optimum temperature between 25캜 and 40캜, but growing within the limits of 10캜 and 45캜. Origin: meso-+ G. Philos, fond (05 Mar 2000) |
| mesophile | <biology> Organism living in the temperature range around that of warm-blooded animals, usually between 20-45 degrees C. (09 Oct 1997) |
| mesophilic | An optimum temperature for bacterial growth in an enclosed digester (25> To 40>C). (05 Dec 1998) |
| mesophlebitis | Inflammation of the middle coat of a vein. Origin: meso-+ phlebitis (05 Mar 2000) |