Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The hard, siliceous bivalve shell of a diatom.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The siliceous shell of a diatom.

from the GNU version of the Collaborative International Dictionary of English

  • n. The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover.

from The Century Dictionary and Cyclopedia

  • n. A small fragment.
  • n. The silicious shell of a diatom; a testule.

Etymologies

French, from Latin frūstulum, diminutive of frūstum, piece broken off.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin frustulum, from frustum ("morsel"). (Wiktionary)

Examples

  • Electrodes were inserted through the frustule into the cytoplasmic rich nuclear region of the cell (photomicrograph inset, scale bar 20 µm).

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  • 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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