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dark-haired
dark sector
(astrophysics, cosmology, astronomy, physics) The unknown portion of the Universe outside standard physics, including dark matter and dark energy.
dark territory
(US, rail transport) A section of railroad track not controlled by signals.
dark territories
plural of dark territory
Dark Ages
(see usage notes) The period of European history encompassing (roughly) 476–1000 CE. / (Ancient Greece) The Greek Dark Ages (c. 1100–750 BCE). / The dark ages of Cambodia (c. 1450–1863).
virtual darkness
dark-skinned
whistle in the dark
(colloquial) To make a show of bravery despite one's fears; to put on a brave face. / (idiomatic, US) To speak of something despite having little knowledge of it.
（ present singular third-person ）
（ participle present ）
（ participle past ）
（ past ）
dark meats
dark energy
(astronomy, astrophysics) A hypothetical form of energy which, it is supposed, is spread uniformly throughout space (and time) and has anti-gravitational properties: it represents a possible mechanism for the cosmological constant, and thus is one of the possible explanations for the current accelerating rate of expansion of the universe; and it is estimated to account for about 74% of the mass-energy of the universe.
