an·nu·lus /ˈænjələs/
 環,輪,體環


 an·nu·lus /ˈænjələs/ 名詞
 環,菌環,孔環,體環,環狀部(動),


 An·nu·lus n.; pl. Annuli
 1. A ring; a ringlike part or space.
 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.
 3. Zool. Ring-shaped structures or markings, found in, or upon, various animals.

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 annulus
      n 1: a toroidal shape; "a ring of ships in the harbor"; "a halo
           of smoke" [syn: ring, halo, anulus, doughnut, {anchor
           ring]
      2: (Fungi) remnant of the partial veil that in mature mushrooms
         surrounds the lower part of the stem
      [also: annuli (pl)]