Definitions from Wiktionary (dark matter)

▸ noun:  (astronomy, astrophysics, loosely) Matter which cannot be detected by its radiation but whose presence is inferred from gravitational effects.
▸ noun:  (particle physics, cosmology, strictly) Matter which has mass but which does not readily interact with normal matter except through gravitational effects.
▸ noun:  (biology, informal) Unclassified or poorly understood genetic material.
▸ Also see dark_matter


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