(physics and chemistry) the simplest structural unit of an element or compound
atom, molecule, particle, corpuscle, mote, speck(noun)
(nontechnical usage) a tiny piece of anything
The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.
A tiny amount.
Origin: Summary: from molécule, from molecula, diminutive of moles; see mole.
one of the very small invisible particles of which all matter is supposed to consist
the smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state
a group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom
Origin: [Dim. fr. L. moles a mass: cf. F. molcule. See 3d Mole.]
A molecule is an electrically neutral group of two or more atoms held together by covalent chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term molecule is often used less strictly, also being applied to polyatomic ions. In the kinetic theory of gases, the term molecule is often used for any gaseous particle regardless of its composition. According to this definition, noble gas atoms are considered molecules despite being composed of a single non-bonded atom. A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen; or it may be a chemical compound composed of more than one element, as with water. Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules. Molecules as components of matter are common in organic substances. They also make up most of the oceans and atmosphere. However, the majority of familiar solid substances on Earth, including most of the minerals that make up the crust, mantle, and core of the Earth, contain many chemical bonds, but are not made of identifiable molecules. Also, no typical molecule can be defined for ionic crystals and covalent crystals, although these are often composed of repeating unit cells that extend either in a plane or three-dimensionally. The theme of repeated unit-cellular-structure also holds for most condensed phases with metallic bonding, which means that solid metals are also not made of molecules. In glasses, atoms may also be held together by chemical bonds without presence of any definable molecule, but also without any of the regularity of repeating units that characterises crystals.
Chambers 20th Century Dictionary
mol′e-kūl, n. one of the minute particles of which matter is composed: the smallest mass of any substance which retains the properties of that substance.—adj. Molec′ular, belonging to, or consisting of, molecules.—n. Molecular′ity.—Molecular attraction, attraction acting on the atoms or molecules of a body, as distinguished from attraction of gravitation. [Fr.,—L. moles, a mass.]
The Nuttall Encyclopedia
the smallest particle of which an element or a compound body is composed, and that retains all the properties in a free state.
British National Corpus
Rank popularity for the word 'molecule' in Nouns Frequency: #1696
The numerical value of molecule in Chaldean Numerology is: 9
The numerical value of molecule in Pythagorean Numerology is: 5
Sample Sentences & Example Usage
Glyceraldehyde is a molecule of outstanding importance.
You're looking at about seven feet of tubing before the molecule of air ever actually enters the head.
There are actually more molecules of glucose in a cup than there are molecules of sucrose, because glucose is a smaller molecule.
It never ceases to amaze me how a simple molecule such as saccharin— something many people put in their coffee every day— may have untapped uses, including as a possible lead compound to target aggressive cancers.
One of them is an enzyme that splits the molecule in wheat that causes celiac disease, gluten, into smaller harmless products and another one promises to make the gut less leaky and thus prevent potentially toxic substances (from) reaching deeper layers where they may cause inflammation.
Images & Illustrations of molecule
Translations for molecule
From our Multilingual Translation Dictionary
- molèculaCatalan, Valencian
- व्यूहाणु, अणुHindi
- mólekúl, sameindIcelandic
- ម៉ូលេគុល, អណូKhmer
- 分子, 분자Korean
- molekylNorwegian Nynorsk
- молекулæOssetian, Ossetic
- cząsteczka, molekułaPolish
- مولېكۇلاUyghur, Uighur
- phân tửVietnamese
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