American Heritage® Dictionary of the English Language, Fourth Edition
- n. A part or particle considered to be an irreducible constituent of a specified system.
- n. The irreducible, indestructible material unit postulated by ancient atomism.
- n. An extremely small part, quantity, or amount.
- n. Physics & Chemistry A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons. The entire structure has an approximate diameter of 10-8 centimeter and characteristically remains undivided in chemical reactions except for limited removal, transfer, or exchange of certain electrons.
- n. Physics & Chemistry This unit regarded as a source of nuclear energy. See Table at subatomic particle.
Century Dictionary and Cyclopedia
- n. An extremely minute particle of matter: a term used generally with certain philosophic or scientific limitations. A hypothetical particle of matter so minute as to admit of no division; an ultimate indivisible particle of matter. See
atomic philosophy, under atomic.
- n. A particle of matter assumed not to be divided under the circumstances considered; a molecule.
- n. In chem. and physics, the unit of matter; the smallest mass of an element that exists in any molecule. The number of kinds of atoms is the same as the number of the elements. All atoms of the same element have the same constant weight. They are for the most part combined with other atoms, either of the same or of a different kind, forming molecules, and are indivisible by chemical force. The atom is sometimes called the chemical unit, in distinction from the molecule or physical unit, the latter being the smallest particle of any kind of matter which can exhibit all the properties of that matter; but atom is also sometimes used as synonymous with molecule in this sense.
- n. Hence Anything extremely small; a minute quantity: as, he has not an atom of sense.
- n. The smallest division of time, equal to about ⅙ of a second.
- n. Anything indivisible; an individual. Synonyms Molecule, etc. See
- To reduce to atoms; atomize.
- n. The smallest, indivisible constituent part or unit of something.
- n. physics The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
- n. mathematics A non-zero member of a Boolean algebra that is not a union of any other elements.
- n. historical A theoretical particle of matter, imagined to be incapable of further division; the smallest possible unit of substance.
- n. obsolete The smallest medieval unit of time, equal to fifteen ninety-fourths of a second.
- n. computing, programming An individual number or symbol, as opposed to a list. A scalar value.
- n. A very small amount.
GNU Webster's 1913
- n. An ultimate indivisible particle of matter.
- n. An ultimate particle of matter not necessarily indivisible; a molecule.
- n. A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.
- n. (Chem.) The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
- n. Anything extremely small; a particle; a whit.
- v. obsolete To reduce to atoms.
- n. (physics and chemistry) the smallest component of an element having the chemical properties of the element
- n. (nontechnical usage) a tiny piece of anything
- From Old French atome, from Latin atomus ("smallest particle"), from Ancient Greek ἄτομος (atomos, "indivisible"), from ἀ- (a-, "not") + τέμνω (temnō, "I cut"). (Wiktionary)
- Middle English attome, from Latin atomus, from Greek atomos, indivisible, atom : a-, not; see a-1 + tomos, cutting (from temnein, to cut. (American Heritage® Dictionary of the English Language, Fourth Edition)
“We now suppose that it is _a rapid movement of electrons from atom to atom_ in the wire or wherever the current is.”
“Coined in ancient Greece, the term atom means “indivisible unit,” and through the nineteenth century, scientists believed that our entire physical universe was composed of these elementary particles.”
“While the term atom, therefore, is applicable only to elements, the term molecule is applicable both to elements and compounds.”
“Thus the term atom indicates not only the constituents of molecules but has a quantitative meaning, the proportional part of the element which enters into compounds.”
“I do think that harnessing the power of the atom is the way to go.”
“The energy produced by the breaking down of the atom is a very poor kind of thing.”
“It was the ancient Greeks who gave us the idea of atoms, fundamental and invisibly small particles of matter, and also the word atom, which means “uncuttable,” “indivisible.””
“(For convenience, "atom" is included as a special case of molecule).”
“When the nucleus of an atom is split apart, a tremendous amount of energy is released.”
“A uranium atom is a very complicated mechanism, but does tend to break down on occasion* — but it's still a lot more reliable than any human device.”
These user-created lists contain the word ‘atom’.
All the scientific words found in the official EU nomenclature. For the screening I used Vocabgrabber of the Visual Thesaurus.
A collection of words found in English that are either purely Greek or have Greek etymology.
Please add with caution and certainty. Will be regularly updated by me.
includes words of the "Prodcom list"
Culturally defined terms and expressions from the four corners of the world
Words with definitions that have a "hence" in them.
Words that, as I see it, have some fond connection to the Alice stories through their creation or particular use by Lewis Carroll. I mean to tie them all together with contexty comments!
Words that describe a smallest possible amount, trace, or degree; a fundamental unit; an irreducible constituent; a smallest, indivisible constituent part or unit; a least possible positive value; ...
random scientific terms from a group of one hundred 16-18 year olds to choose 100 words that, in their collective opinion, represent crucial factors and concepts influencing trends in science today...
My big word list.
Words that have been used as baby names, including virtue names, nature names, place names, etc.
The title is an actual name given to a Puritan boy in the 17th century.
This is a list of my favourite words (phrases) in english, as a second language. I love them mostly because of how they sound and their meaning.
from the poetry and prose of walt whitman
Particles, particles, particles!
List? What list?
This is the list that makes up the world.
Looking for tweets for atom.