- Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound.
- Chemistry. a quantity of a substance, the weight of which, measured in any chosen unit, is numerically equal to the molecular weight; gram molecule.
- any very small particle.
Origin of molecule
Related Wordsfragment, particle, jot, speck, minim, mote, modicum, bit, mite, iota, unit, ray, ounce
Examples from the Web for molecule
Each type of atom and molecule has its own unique spectrum, according to the rules of quantum mechanics.SAMI Is Like Google Earth for the Universe
Matthew R. Francis
July 27, 2014
Specifically, it targets a molecule called VEGF that sends signals that promote the growth of blood vessels.Jobs’s Unorthodox Treatment
October 6, 2011
And those examples are a molecule in the atom bomb of the Internet.Pro Sports’ Hero Deficit
July 6, 2011
A molecule of carbon dioxide traps heat, radiant heat, the long wave end of the spectrum.Hanging Out with Ian McEwan: Full Transcript
The Daily Beast Video
April 14, 2010
The ion differs from the molecule, the corpuscle and the atom in that it is an ion.The Devil's Dictionary
The ions formed by the dissociation of any molecule are of two kinds.
A molecule is the smallest particle of a compound which can exist.
This will be the sum of the weights of the nitrogen atoms in the molecule.
We cannot be good to an atom of hydrogen, or unjust to a molecule of water.The Truth of Christianity
William Harry Turton
- the simplest unit of a chemical compound that can exist, consisting of two or more atoms held together by chemical bonds
- a very small particle
Word Origin and History for molecule
1794, "extremely minute particle," from French molécule (1670s), from Modern Latin molecula, diminutive of Latin moles "mass, barrier" (see mole (3)). A vague meaning at first; the vogue for the word (used until late 18c. only in Latin form) can be traced to the philosophy of Descartes. First used of Modern Latin molecula in modern scientific sense by Amedeo Avogadro (1811).
- The smallest particle into which an element or a compound can be divided without changing its chemical and physical properties; a group of atoms that is held together chemically.
- A group of two or more atoms linked together by sharing electrons in a chemical bond. Molecules are the fundamental components of chemical compounds and are the smallest part of a compound that can participate in a chemical reaction.