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