Myzorhynchus

(mi-zo-ring’kus). A genus of anopheline mosquitos, several species of which act as the carriers of malarial parasites. Myxoma A sarcoma ch016.xhtml **N** N NW. Symbol for nitrogen. mn. 1. The symbol for index of refraction. 2. A chemical symbol for normal. N . A. Abbreviation for numeric aperture.