from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An apparatus used to measure the size and concentration of particles in a liquid by analysis of light scattered by the liquid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument for measuring various aspects of the suspended particles in a fluid; especially in a colloid.
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for measuring or registering the amount of cloudiness.
- n. An instrument which measures the degree to which liquid suspensions scatter light, and by inference, the concentration of scattering particles in the suspension. It is used for various purposes, such as to estimate the number of bacteria in suspension in a liquid.
from The Century Dictionary and Cyclopedia
- n. A proposed instrument which will make a continuous record of the proportion of cloudiness of the sky. No such instrument has yet been constructed.
- n. In chem., an instrument for estimating the quantity of a solid substance suspended, in very small proportion and in a very finely divided state, in a liquid, as in the case of one or two milligrams of silver chlorid in a liter of water.
Greek nephelē, cloud; see nebh- in Indo-European roots + -meter.(American Heritage® Dictionary of the English Language, Fourth Edition)