annuli

1 definition found

annuli - Collaborative International Dictionary of English v.0.48 :

  Annulus \An"nu*lus\, n.; pl. Annuli. [L.]
     1. A ring; a ringlike part or space.
        [1913 Webster]
  
     2. (Geom.)
        (a) A space contained between the circumferences of two
            circles, one within the other.
        (b) The solid formed by a circle revolving around a line
            which is the plane of the circle but does not cut it.
            [1913 Webster]
  
     3. (Zool.) Ring-shaped structures or markings, found in, or
        upon, various animals.
        [1913 Webster]