A ring- or donut-shaped area or structure. / (geometry) The region in a plane between two concentric circles of different radii.

superlative form of mardy: most mardy

The state of being perceptive; acumen, discernment, insight

(astronomy) A galaxy which has stopped star formation due to the energetic winds spewing forth from the active galactic nucleus, heating and disrupting gas accumulation and collapse to form new sta...