from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument for determining the direction of and angular velocity of clouds.
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for observing the clouds and their velocity.
from The Century Dictionary and Cyclopedia
- n. An instrument used in determining the apparent velocity and the direction of motion of clouds.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a measuring instrument that uses a grid for measuring the altitude, direction, and velocity of movement of clouds
Sorry, no etymologies found.
While taking the observations at midnight, he noticed St. Elmo's fire, a "brush discharge" of electricity, on the points of the nephoscope.
Close by there was also a nephoscope for determining the motion of clouds.