dark matterˈdark ˌmatter noun [uncountable] technical 
a type of matter that scientists think may exist. It cannot be seen but seems to affect the movements of stars
a type of matter that scientists think may exist. It cannot be seen but seems to affect the movements of stars- art gallery
- art house
- arthritic
- arthritis
- Arthur
- Arthur, Chester Alan
- Arthurian
- Arthurian Legend
- artichoke
- article
- articled
- Articles of Confederation
- articulate
- articulated
- articulately
- articulation
- artifact
- artifice
- artificial
- artificial insemination
- artificial intelligence
- artificiality
- artificially
- artificial respiration
- artillery