87. Clouds

See also 27. ATMOSPHERE ; 345. RAIN ; 375. SNOW ; 417. WEATHER .

ceilometer

an instrument for measuring by triangulation and recording the distance between the earth and the cloud ceiling.

nephelognosy

divination by the observation of clouds.

nepheloscope

an apparatus for expanding moist air to demonstrate the process of cloud formation.

nephogram

a photograph of clouds, taken with a nephograph.

nephograph

an instrument for photographing clouds and producing nephrograms.

nephology

the branch of meteorology that studies clouds. — nephologic, nephological , adj . — nephologist , n .

nephophobia

an abnormal fear of clouds.

noctilucence

the condition of being visible during the short summer nights, especially high-altitude clouds. — noctilucent adj .

nubilation

1. the formation or arrangement of clouds.

2. the obscuration caused by clouds.