• WordNet 3.6
    • n diatom microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica
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Webster's Revised Unabridged Dictionary
    • Diatom A particle or atom endowed with the vital principle. "The individual is nothing. He is no more than the diatom , the bit of protoplasm."
    • Diatom (Bot) One of the Diatomaceæ, a family of minute unicellular Algæ having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariæ, but this word is not in general use.
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Century Dictionary and Cyclopedia
    • n diatom A member of the Diatomaceæ;
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Chambers's Twentieth Century Dictionary
    • n Diatom dī′a-tom one of an order of microscopic unicellular algæ, of the Diatomaceæ
    • ***


Webster's Revised Unabridged Dictionary
Gr. dia`tomos cut in two. See Diatomous
Chambers's Twentieth Century Dictionary
Gr. diatomosdia, through, temnein, to cut.


In literature:

The graceful Diatom is a morsel of plasm enclosed in a flinty box, often with a very pretty arrangement of the pores and markings.
"The Story of Evolution" by Joseph McCabe
The vegetable kingdom is represented by plants of low organization such as mosses, lichens, diatoms and algae.
"The Home of the Blizzard" by Douglas Mawson
Clodd tells us that one cubic inch of rotten stone contains 41 thousand million vegetable skeletons of diatoms.
"God and my Neighbour" by Robert Blatchford
Abundance of Gemiasma verdans, Sphaerotheca Diatoms.
"Scientific American Supplement, No. 384, May 12, 1883" by Various
Diatoms, pollen, found in greenish earth and wet with the dew.
"Scientific American Supplement, No. 385, May 19, 1883" by Various
I am told that in parts of California infinitesimal diatoms form deposits five thousand feet in thickness.
"A Backward Glance at Eighty" by Charles A. Murdock
Diatoms; of the Devonian; of the Carboniferous; of flints; of Richmond Earth.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
This coloration is caused by minute unicellular plants called diatoms.
"The Worst Journey in the World, Volumes 1 and 2" by Apsley Cherry-Garrard
There are also some very minute forms of vegetable life, which exist in equally vast numbers, called Diatoms.
"Young Folks' Library, Volume XI (of 20)" by Various
Then diatoms keep gliding athwart the circle.
"Certain Personal Matters" by H. G. Wells
Food consists of foreign objects, diatoms, other protozoa and the like.
"Marine Protozoa from Woods Hole" by Gary N. Calkins
Diatoms leave strata of powdered teflon.
"Uller Uprising" by Henry Beam Piper, John D. Clark and John F. Carr
For I supposed that the specks consisted of diatom ooze.
"The Voyage of the Vega round Asia and Europe, Volume I and Volume II" by A.E. Nordenskieold
Other strata of rocks are made up of the skeletons of diatoms.
"Under the Maples" by John Burroughs
Hence it may be inferred that this value is typical for diatomic molecules.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
The diatoms exhibit great variety of form.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various
The molecule of iodine, for example, is monatomic at 1200deg C., but becomes diatomic at the ordinary temperature.
"The Mechanism of Life" by Stéphane Leduc
From this the skeletons of radiolaria and diatoms and the spicules of sponges are formed.
"The Geological Story of the Isle of Wight" by J. Cecil Hughes
Diatom ooze is the characteristic deposit in high southern latitudes.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 8" by Various
A great variety of forms are found, both diatoms and desmids, many still undescribed, inviting the young microscopist to study and name them.
"Through a Microscope" by Samuel Wells

In news:

A glow coming from the glassy shell of microscopic marine algae called diatoms could someday help detect chemicals and other substances in water samples.
Structurally, NO is a small, unstable, diatomic radical.
A microscope reveals marine diatom cells, which are an important group of phytoplankton in the oceans.
Diatoms could make biofuels, electronics and health food - all at the same time .
Amphipod to diatom to bacterium , in one GIF.
Diatoms could make biofuels, electronics and health food - all at the same time.
"Depending on the site, the first thing that settles is algae and diatoms," says Robin Sherman, a Nova Southeastern University biologist who has studied artificial reefs .

In science:

Oxygen is depleted because it is trapped in unsputtered silicate grains and in CO molecules, while carbon is much more depleted (by a factor of 3) because it is trapped into graphite grains, PAHs, and diatomic molecules like CO, CN, CS, etc. (Contini & Shaviv 1982).
The symbiotic system AG Draconis. Soft X-ray bremsstrahlung from the nebulae
The depleted elements are trapped into dust grains (silicates and graphite) and/or into diatomic molecules (CO, CN, CS, etc.).
The symbiotic system AG Draconis. Soft X-ray bremsstrahlung from the nebulae
Herzberg, NIST Chemistry WebBook, NIST Standard Reference Database, vol. 69 of Constants of Diatomic Molecules (National Institute of Standards and Technology, Gaithersburg MD, 2012). J. I.
Coherent anti-Stokes Raman spectroscopy in the presence of strong resonant signal from background molecules
Diatomic molecules, particularly diatomic hydrides of the more abundant elements, are often observed through their infrared spectra.
Division Xii/commission 14/WORKING Group on Molecular Data
A dimer is a diatomic molecule occupying two connected sites of a graph. A graph is close-packed if all sites are occupied precisely once.
Diffraction of random tilings: some rigorous results
We will retain the traditional term diatomic.
The standing wave model of the mesons and baryons
For the double integral in (18) of the corrected axial diatomic frequencies we find the value π 3 as can be easily derived from the plot of the corrected frequencies in Fig. 6.
The standing wave model of the mesons and baryons
The function f(φ1 , φ2) in Eq.(37) describing the frequency spectrum of the oscillations are the same for the diatomic neutrino pairs in the π± mesons and the diatomic neutrino pairs in the µ mesons because they must obey the group velocity limitation.
The standing wave model of the mesons and baryons
But since the same applies for the diatomic oscillations of the ¯νµ - ¯νe pairs in the µ± mesons, the sum of the energies of both oscillations is equal to the oscillation energy of the π± mesons, as (b) says.
The standing wave model of the mesons and baryons
One very ambitious current goal for ultra-cold atom research involves cold fermionic atoms, where association of the fermionic atoms into bose condensed diatomic molecules has just been reported by several groups , and where current efforts aim at the observation of BCS superfluidity of the gas .
Number distributions for fermions and fermionized bosons in periodic potentials
There will be two independent components for a diatomic molecule, similarly to a P -state atom interacting with a surface .
Long-range atom-surface interactions for cold atoms
This makes it possible to study the system as it evolves from a dilute Fermi gas with weak attractive interactions to a bosonic gas of diatomic molecules.
Density functional theory for fermions close to the unitary regime
The example shows two equivalent ways of drawing an interaction between two diatomic molecules, with sites labelled “1” and “2”.
Diagrammatic analysis of correlations in polymer fluids: Cluster diagrams via Edwards' field theory
This is different from the earlier study in diatom.
Gauge field in ultra-cold bipartite atoms
In Fig. 4(a) there are examples of such plot for a Lennard-Jones potential, a type of potential used to describe diatomic molecules and that has a single minimum.