Pronunciation: (nef"u-nal'u-sis), [key]
—pl. -sesPronunciation: (-sēz"). [key]
1. a map or chart showing the distribution of types and amounts of clouds and precipitation at a given time.
2. the preparation of such a map or chart.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.