Word Study
    Frustule
CIDE DICTIONARY
Frustule, n. [L. frustulum, dim. fr. frustum a piece: cf. F. frustule.]. 
                                            
                                         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]                                                                                                                    
                                                                                    OXFORD DICTIONARY
Frustule, n.  Bot.  the siliceous cell wall of a diatom.
                    Etymology
                        F f. L frustulum (as FRUSTUM)
                                    
            For further exploring for "Frustule" in Webster Dictionary Online
        

