American Heritage® Dictionary of the English Language, Fourth Edition
- n. The hard, siliceous bivalve shell of a diatom.
Century Dictionary and Cyclopedia
- n. A small fragment.
- n. The silicious shell of a diatom; a testule. It consists of two valves, one somewhat larger than the other, and closing over it like the lid of a box. The back of each valve is called the side of the frustule; the surface marked by the line of juncture, the front. See cut under
GNU Webster's 1913
- n. (Bot.) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover.
- Latin frustulum, from frustum ("morsel"). (Wiktionary)
- French, from Latin frūstulum, diminutive of frūstum, piece broken off. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Electrodes were inserted through the frustule into the cytoplasmic rich nuclear region of the cell (photomicrograph inset, scale bar 20 µm).”
“The approximately cyclindical cells (50-70 µm long by 20-40 µM in diameter) were impaled though the silica frustule aided by capacitance over compensation.”
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