Definition of atoms in English

Wiktionary

atoms (Noun)
Plural of atom.

Part of speech

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atoms, noun, plural of atom.

WordNet

Noun Plural: atoms
atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
		substance the real physical matter of which a person or thing consists; "DNA is the substance of our genes"
		chemical element, element the most favorable environment for a plant or animal; "water is the element of fishes"
		molecule (physics and chemistry) the simplest structural unit of an element or compound
		natural philosophy, physics the science of matter and energy and their interactions; "his favorite subject was physics"
		chemical science, chemistry the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
		elementary particle, fundamental particle (physics) a particle that is less complex than an atom; regarded as constituents of all matter
		nucleus a part of the cell containing DNA and RNA and responsible for growth and reproduction
		isotope one of two or more atoms with the same atomic number but with different numbers of neutrons
		monad (biology) a single-celled microorganism (especially a flagellate protozoan)
		carbon atom an atom of carbon
		hydrogen atom an atom of hydrogen
atom - (nontechnical usage) a tiny piece of anything
		molecule, particle, corpuscle, mote, speck
		material, stuff things needed for doing or making something; "writing materials"; "useful teaching materials"
		grain the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric; "saw the board across the grain"
		grinding a harsh and strident sound (as of the grinding of gears)
		chylomicron a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood
		flyspeck a tiny dark speck made by the excrement of a fly

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Wiktionary

atom (Noun)
The smallest, indivisible constituent part or unit of something.
atom (Noun)
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.
atom (Noun)
A theoretical particle of matter, imagined to be incapable of further division; the smallest possible unit of substance.
atom (Noun)
The smallest medieval unit of time, equal to fifteen ninety-fourths of a second.
atom (Noun)
An individual number or symbol, as opposed to a list. A scalar value.
atom (Noun)
A very small amount.

Webster DictionaryWebster's Unabridged Dictionary 📘

atom (n.)
An ultimate indivisible particle of matter.
atom (n.)
An ultimate particle of matter not necessarily indivisible; a molecule.
atom (n.)
A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.
atom (n.)
The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
atom (n.)
Anything extremely small; a particle; a whit.
atom (v. t.)
To reduce to atoms.

OmegaWiki DictionaryOmegaWiki Dictionary Ω

atom
(chemistry and physics), is the smallest possible particle of a chemical element that retains its chemical properties.

Chambers DictionaryChamber's 20th Century Dictionary 📕

atom
at′om, n. a particle of matter so small that it cannot be cut or divided, the unit of matter; anything very small.—adjs. Atom′ic, -al, pertaining to atoms.—ns. Atomic′ity; Atomisā′tion (med.) the reduction of liquids to the form of spray; At′omism, the doctrine that atoms arranged themselves into the universe: the atomic theory; At′omist, one who believes in atomism.—adj. Atomis′tic.—adv. Atomist′ically.—n. At′omy, an atom, or mote: (Shak.) a pygmy.—Atomic philosophy, a system of philosophy enunciated by Democritus, which taught that the ultimate constituents of all things are indivisible particles, differing in form and in their relations to each other; Atomic theory, the hypothesis that all chemical combinations take place between the ultimate particles of bodies, uniting each atom to atom, or in proportions expressed by some simple multiple of the number of atoms. [Gr. atomos—a, not, temnein, tamein, to cut. See Atom.]

Wikipedia

An atom is the most simple type of particle that makes up matter. Matter is anything that has mass and uses space. It is the smallest part of an element that still has the properties of that certain element. When you see atoms as ball-shaped, they have diameters of about 10-10 meters (that's 0.0000000001 m). They have masses around 10-23g (that's 0.00000000000000000000001 g.)

Origin.

The word "atom" comes from the Greek ἀτόμος, "indivisible", from ἀ-, "not," and τόμος, "a cut." Until the end of the 19th century, many people believed atoms were very tiny, solid balls which could never be divided. This idea comes from Democritus and Leucippus, Greek philosophers in the 5th century BC. People believed this until the early 20th century when tests by physicists trying to provide nuclear power disproved it.

Types of atom.

Atoms are made of 3 kinds of sub-atomic particles - protons, neutrons and electrons. A proton has a positive charge. A neutron has no charge. An electron has a negative charge. Electrons have much less weight than the protons and neutrons. Electrons move very fast around the nucleus. In a neutral atom, the number of protons is the same as the number of electrons. In other atoms, such as [b]isotopes[/b] the number of neutrons is not the same as the number of protons.

Charged atoms are called ions. Atoms with fewer electrons than protons have a positive charge. These atoms are called cations. Atoms with more electrons than protons have a negative charge. These atoms