See also atmosphere; rain; snow; weather.
an instrument for measuring by triangulation and recording the distance between the earth and the cloud ceiling.
divination by the observation of clouds.
an apparatus for expanding moist air to demonstrate the process of cloud formation.
a photograph of clouds, taken with a nephograph.
an instrument for photographing clouds and producing nephrograms.
the branch of meteorology that studies clouds. —nephologic, nephological
an abnormal fear of clouds.
the condition of being visible during the short summer nights, especially high-altitude clouds. —noctilucent adj
the formation or arrangement of clouds.
the obscuration caused by clouds.