diatom frustule

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• Frustule — A frustule is the hard and porous cell wall or external layer belonging to diatoms. The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, sometimes pectin, a fiber most commonly …   Wikipedia

• 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] …   The Collaborative International Dictionary of English

• frustule — [frus′tyo͞ol΄, frus′cho͞ol΄] n. [Fr < L frustulum, dim. of frustum, a piece: see FRUSTUM] either of the two interlocking halves of the hard, siliceous shell of a diatom cell …   English World dictionary

• Diatom — For a molecule of two atoms, see Diatomic molecule. Diatoms Marine diatoms Scientific classification Domain …   Wikipedia

• Diatom — Bacillariophyta Bacillariophyta ou Diatomées …   Wikipédia en Français

• frustule — noun The siliceous shell of a diatom. A frustule is the hard and porous cell wall or external layer of diatoms. The frustule is composed almost purely of silica …   Wiktionary

• diatom — /duy euh teuhm tom /, n. any of numerous microscopic, unicellular, marine or freshwater algae of the phylum Chrysophyta, having cell walls containing silica. [1835 45; < NL Diatoma orig. a genus name, fem. n. based on Gk diátomos cut in two. See… …   Universalium

• frustule — noun Etymology: French, from Latin frustulum, diminutive of frustum Date: 1848 the 2 valved siliceous shell of a diatom …   New Collegiate Dictionary

• frustule — /frus choohl/, n. Bot. the siliceous cell wall of a diatom. [1855 60; < F < LL frustulum, dim. of frustum FRUSTUM] * * * …   Universalium

• frustule — [ frʌstju:l] noun Botany the silicified cell wall of a diatom, consisting of two valves or overlapping halves. Origin C19: from L. frustulum, dimin. of frustum (see frustum) …   English new terms dictionary

• frustule — frus•tule [[t]ˈfrʌs tʃul[/t]] n. mcr the shell of a diatom • Etymology: 1855–60; < F < LL …   From formal English to slang