frustule

1 definition found

frustule - Collaborative International Dictionary of English v.0.48 :

  Frustule \Frus"tule\, n. [L. frustulum, dim. fr. frustum a
     piece: cf. F. frustule.] (Bot.)
     The siliceous shell of a diatom. It is composed of two
     valves, one overlapping the other, like a pill box and its
     cover.
     [1913 Webster]