| 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) |
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| 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) |