pleochroic

Definitions  ·  Examples  ·  Pronunciations  ·  Etymologies  ·  Related  ·  Statistics  ·  Comments  · 
“
Under the microscope some of the biotite has a green coloration from decomposition and is surrounded by strong pleochroic halos.

View all »
Definitions (4)

Toggle American Heritage definitions American Heritage Dictionary

Toggle Century definitions Century Dictionary (2)

  1. Exhibiting pleochroism. The epithet includes dichroic and trichroic. Also pleochromatic, pleochroöus, polychroic.
  2. Pleochroic halo or aureole a spot within a mineral (for example, biotite) characterized by strong pleochroism. Such spots are frequently observed in sections when examined under the microscope, and are usually immediately associated with microscopic inclusions.

Toggle GNU Webster definitions GNU Webster's 1913 (1)

Toggle WordNet definitions WordNet (1)

Toggle elsewhere links Elsewhere on the web

View all »
Examples (6)

  • 1986, "Gentry's pleochroic halos: Creation/Evolution," Newsletter, Feser, Karl D., —  Original Signal - Transmitting Digg
  • 285 Glossopteris and Gangamopteris flora, 136 Gondwanaland, 136 Gradient of temperature in Earth's surface crust, 126 H Haimanta period of India, 135 Halley, Edmund, finding age by saltness of ocean, 13 Hallwachs, photo-electric activity and absorption, 207 Haloes, pleochroic, finding age of rocks by, 21; due to uranium and thorium families, 227; radii of, 227; over-exposed and underexposed, 228; intimate structure of, 229 et seq._; artificial, 229; tubular, in mica, 230; extreme age of, 231; effect of nucleus on structure of, 232; inference from spherical form of, in crystals, 233; structure of, unaffected by cleavage, 235; origin of the name "pleochroic,"235; colouration due to iron, 235; colouration not due to helium, 236; age Of, 236; slow formation of, 237, 238; number of rays required to build, 237; and age of the Earth, 238-241 Hayden, H.H., geology of the Himalaya, 134, 138, 139 Heat-tendency of the universe, 62 Heat emission from the Earth's surface, 126; from average igneous rock due to radioactivity, 126 Helium and the alpha ray, 214, 222; colouration of halo not due to, 236 Hering, E., and physiological or unconscious memory, 111 Herschel and Babbage theory of mountain building, 123 Herschel, Sir W., on galaxy of milky way, 293 Hertz, negative electrification discharged by light, 204 Himalaya, geological history of, 134-139 Hobbs, on association of earthquakes and geosynclines, 143 Holmes, A., original lead in minerals, 20; age of Devonian, 21 Horst concerned in Alpine déferlement_, objections to, 156 Hyperion, dimensions of, 177 I Ice, melting of, by pressure, 267 et seq._; expansion of water in becoming, 267; lowering of melting-point by pressure, 267; fall of temperature under pressure, 268 et seq._; viscosity of, 284 Igneous rocks, average composition of, 43 Inanimate actions, dynamic conditions of, 61 Inanimate systems, secondary effects in, 63-65; transfer of energy into, 66 Indian geology, equivalent nomenclature of, 139 Initial recombination of ions due to alpha rays, 221, 222, 231; and structure of the halo, 231 Insect life in the higher Alps, 104, 105; destruction of, on the Alpine snows, 106 Ionisation by alpha ray, density of, 221; importance in chemical actions, 250; in living cell, 250 Ions, number of, produced by an alpha ray, 237 Isostasy, 53; and preservation of continents, 53 Ivy, inconspicuous blossoms of, 107; delay in ripening seed, 107 K Kant and Laplace, material hypothesis of, does not account for the past, 290 Kelvin, Lord, experiment on effects of pressure on ice, 268-270 Kleeman and Bragg. —  The Birth-Time of the World and Other Scientific Essays
  • Under the microscope some of the biotite has a green coloration from decomposition and is surrounded by strong pleochroic halos. —  The Long Labrador Trail
  • Such an effect is called pleochroism, and crystals which show variations in their colour when viewed from different angles, or by transmitted light, are called pleochroic, or pleochromatic -- from two Greek words signifying "to colour more." —  The Chemistry, Properties and Tests of Precious Stones
  • Haloes, pleochroic, finding age of rocks by, 21; due to uranium and thorium families, 227; radii of, 227; over-exposed and underexposed, 228; intimate structure of, 229 _et seq. —  The Birth-Time of the World and Other Scientific Essays
More examples »
 

Tags

pleochroic hasn't been tagged yet.

Sign up or sign in to add tags.

Stats

This word has been looked up 26 times.

stop updating
On Twitter

Photos from

flickr images

Etymologies (1)

Toggle Century etymologies Century Dictionary (1)

  1. from Gr.πλέων,πλείων, more, + χρόα color, + -ic.
 

Pronunciations
Record your own »

If you'd like to prod us on getting a pronunciation for this word, sign in (or sign up) and let us know.

Charts
frequency chart

Bubble size: how much this word was used in a year

Bubble height: used more or less than expected, vs. all uses evenly distributed

We are still working on calculating this word's frequency.

Recently looked up

averse · pauperum · teratological · attesting · provable

Recent Favorites

pygopagus · sanglant · Astacus · sweetbread · qualms

Recent Pronunciations

mamaroneck · maladministration · antidisestablishmentarianism · parsimonious · soliloquy