The area of the annulus is the area of the ring-shaped space between the two circles that define it. In the figure above it is the number of gray square units it takes to fill the annulus. This area is the area of the entire disk, minus the area of the 'hole' in the middle. ( See Area of a Circle): Where:
Webster Dictionary (0.00 / 0 votes) Rate this definition: Avenge (verb) to take vengeance for; to exact satisfaction for by punishing the injuring party; to vindicate by inflicting pain or evil on a wrongdoer
Freebase (0.00 / 0 votes) Rate this definition: Ard. The ard is a rudimentary plough that is light, without a mouldboard, symmetrical on either side of its line of draft, and fitted with a symmetrical share that traces a shallow furrow but does not invert the soil.