nim·bo·stra·tus  (nĭm'bō-strā'təs, -strāt'əs)  n. pl. nim·bo·stra·ti (-strā'tī, -strāt'ī) A low, gray, often dark cloud that precipitates rain, snow, or sleet. [nimb(us) + stratus.] |
| nimbostratus (nĭm'bō-strāt'əs) Pronunciation Key
Plural nimbostrati (nĭm'bō-strāt'ī') A dark, gray, mid-altitude cloud that often covers the entire sky and precipitates rain, snow, or sleet. Nimbostratus clouds generally form around 2,000 m (6,560 ft) but often extend to much higher and lower altitudes. See illustration at cloud. |