Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Matter that emits little or no detectable radiation of its own, postulated to account for gravitational forces observed on astronomical objects and to be part of the missing mass.
Wiktionary
- n. astronomy Particles of matter that cannot be detected by their radiation but whose presence is inferred from gravitational effects.
WordNet 3.0
- n. (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force
Examples
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Lists
These user-created lists contain the word ‘dark matter’.
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Substancestry
Mysterious and theoretical substances and "stuff" of legend. More emphasis on the ancient, mystical, mythical, folklore, mathematical, and scientific. I won't be listing too many "sci-fi" or comed...
ylem, ichor, aether, ectoplasm, impossible object, quark star, eucharist, pixie dust, eitr, elixir of life, philosopher's stone, alkahest and 126 more...
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ghost
This is Ghost List 2 ( the kind that go 'boo!' ) :P
( open list )
more:
http://www.wordnik.com/lists/macabrephantom, spectral, specter, spectre, spooky, poltergeist, haunt, spirit, banshee, cryptic, shadow, phantasm and 311 more...
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science fact or fiction
pretty open-ended here—terms, ideas, lingo, technologies and phenomena (real or postulated) that are, were, should be or could be used in speculative fiction
tachyon, mecha, dropship, wetware, meatspace, nanobot, cloned meat, asteroid mining, hyperdrive, wormhole, parallel universe, distributed intel... and 464 more...
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the clash
two different words that create temporary or permanent confusion when put together (a lexical paradox).
(paradoxic juxtapositions, or atypical oxymorons unlike the ones in these lists: oxym...ambidextrous dysl..., inverted erection, publicly private, cohesive disinteg..., suspended launch, controlled chaos, calm panic, mathematical joke, moral hazard, simple complexity, flightless bird, scared stiff and 60 more...
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Blinded with Science
Words and phrases linked with Science & Mathematics.
mandelbrot set, dark matter, heisenberg's unce..., naked singularity, dark energy, chaos theory, schrödinger's cat, quantum chromodyn..., event horizon, simple harmonic m..., greedy algorithm, hardy-weinberg eq... and 1 more...
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States of Matter
I don't believe a list like this has been done before. This list includes actual states, hypothetical states, and fictional states.
solid, liquid, gas, plasma, amorphous solid, crystalline solid, superfluid, bose-einstein con..., fermionic condensate, Rydberg molecule, strange matter, dark matter and 7 more...
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•Open List: The Holy Pantheon of WTF
See John's link on McGangBang. I am seriously hungry right now.
For those who are interested, you can see all the words tagged "WTF" here. I would appreciate it if we kept that (rather...mcgangbang, e-cigarette, platypus, casu marzu, bagpipes, macropinna micros..., bacon explosion, turducken, cabeza de jabali, the demon moustac..., national lint pro..., quasars and 25 more...
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Miscellaneous
‽, ☤, mandelbrot, angora rabbit, psychrolutes marc..., vampyroteuthis in..., basking shark, mano de desierto, underwater sculpt..., surgical dining, gyroscope, Derinkuyu and 161 more...
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tales from another world
words with that sci-fi flavor.
nexus, crux, vortex, morph, flux, quantum, quasar, polarity, paradox, nebulae, node, event horizon and 18 more...
Tweets
Looking for tweets for dark matter.
whichbe In astrophysics and cosmology, dark matter is a hypothetical form of matter that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can be inferred from gravitational effects on visible matter. According to present observations of structures larger than galaxies, as well as Big Bang cosmology, dark matter accounts for the vast majority of mass in the observable universe. (Wikipedia) May 20, 2008