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• n  a toroidal shape
• n  (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar

• The layers of the annulus are woven for maximum absorption.
• The layers of the annulus are woven for maximum absorption.

• ring
• halo
• doughnut
• anchor ring
• skirt

News & Articles

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• Worst Hanford tank may be leaking into soil
  The first ever double-shell tank to have leaked at Hanford may be in far worse condition than anyone imagined. Hanford workers conducting routine maintenance on the tank, known as AY-102, Thursday were shocked to find readings of radioactivity from material outside the tank. Until now leaked nuclear sludge had only been detected in what's known as the tank's annulus -- the hollow safety space ...
  June 21, 2013 - NorthWest Cable News