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| an·nu·lus [ ánnyələss ] (plural an·nu·li [ ánnyə l ] or an·nu·lus·es) |
noun |
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| Definition: |
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1. biology ring-shaped part: a ring-shaped part or arrangement of parts in a plant or animal, e.g. a growth ring on fish scales
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2. mathematics area between concentric circles: the area bounded by two concentric circles
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| [Mid-16th century. < Latin an(n)ulus "small ring" < anus "ring"] |
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