an automatic device for measuring and recording the height of clouds by projecting a modulated beam of light onto a cloud base, receiving the reflection of light through a photoelectric apparatus, and computing the height by triangulation.
a device for determining the cloud ceiling, esp by means of a reflected light beam
An instrument for calculating the altitude of the lowest cloud layer in the sky. A ceilometer consists of a projector that shines an intense beam of light (usually laser light) at the cloud layer and a photoelectric cell that detects the light as it is reflected back. The distance between the projector and the photoelectric cell and the angle at which the light is detected are used to calculate the altitude of the cloud layer by triangulation; alternatively, the time required for the light to be reflected back to the detector may be used to measure the distance, as in radar.
noun (in ancient Greek tradition) the first king of Attica, represented as half-human, half-dragon Historical Examples
a large North American silkworm moth, Hyalophora cecropia, the larvae of which feed on the foliage of forest and other trees. noun a large North American saturniid moth, Hyalophora (or Samia) cecropia, with brightly coloured wings and feathery antennae
Camilo José [kah-mee-law haw-se] /kɑˈmi lɔ hɔˈsɛ/ (Show IPA), 1916–2001, Spanish writer. Historical Examples noun Camilo José (kaˈmilo xoˈse). 1916–2002, Spanish novelist and essayist. His works include The Family of Pascual Duarte (1942), La Colmena (1951), and La Cruz de San Andres (1994). Nobel prize for literature 1989
any of several Chinese porcelains having a translucent, pale green glaze. any porcelain imitating these. a pale gray-green. having the color celadon. Historical Examples noun a type of porcelain having a greyish-green glaze: mainly Chinese a pale greyish-green colour, sometimes somewhat yellow n. “pale grayish-green,” 1768, from French Céladon, name of a character in the […]
a hydrous silicate of iron and potassium; an iron-rich soft mica.