Definitions for moleculeˈmɒl əˌkyul

This page provides all possible meanings and translations of the word molecule

Princeton's WordNetRate this definition:(5.00 / 1 vote)

  1. molecule(noun)

    (physics and chemistry) the simplest structural unit of an element or compound

  2. atom, molecule, particle, corpuscle, mote, speck(noun)

    (nontechnical usage) a tiny piece of anything

WiktionaryRate this definition:(5.00 / 1 vote)

  1. molecule(Noun)

    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.

  2. molecule(Noun)

    A tiny amount.

  3. Origin: Summary: from molécule, from molecula, diminutive of moles; see mole.

Webster DictionaryRate this definition:(5.00 / 1 vote)

  1. Molecule(noun)

    one of the very small invisible particles of which all matter is supposed to consist

  2. Molecule(noun)

    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

  3. Molecule(noun)

    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

  4. Origin: [Dim. fr. L. moles a mass: cf. F. molcule. See 3d Mole.]

FreebaseRate this definition:(5.00 / 1 vote)

  1. Molecule

    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.

The Nuttall EncyclopediaRate this definition:(5.00 / 1 vote)

  1. Molecule

    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

  1. Nouns Frequency

    Rank popularity for the word 'molecule' in Nouns Frequency: #1696


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